| P Blood-Group System | 
              | P Selectin use P-Selectin | 
              | p Wave | 
              | p-Aminoazobenzene | 
              | p-Aminobenzoic Acid use 4-Aminobenzoic Acid | 
              | p-Aminohippuric Acid | 
              | p-Aminosalicylic Acid use Aminosalicylic Acid | 
              | p-ANCA use Antibodies, Antineutrophil Cytoplasmic | 
              | p-Azobenzenearsonate | 
              | P-B Antibodies use Antibodies, Heterophile | 
              | p-Bromdylamine use Brompheniramine | 
              | P-Cadherins use Cadherins | 
              | P-Cell Stimulating Factor use Interleukin-3 | 
              | p-Chloramphetamine use p-Chloroamphetamine | 
              | p-Chloroamphetamine | 
              | p-Chloromercuribenzoic Acid | 
              | p-Chlorophenylalanine use Fenclonine | 
              | p-Dihydroxybenzenes use Hydroquinones | 
              | p-Dimethylaminoazobenzene | 
              | p-Fluorophenylalanine | 
              | P-Glycoprotein | 
              | P-Glycoproteins | 
              | p-Hydroxyamphetamine | 
              | p-Hydroxybenzoate Hydroxylase use 4-Hydroxybenzoate-3-Monooxygenase | 
              | p-Hydroxynorephedrine | 
              | P-Hydroxyphenylpyruvate Hydroxylase use 4-Hydroxyphenylpyruvate Dioxygenase | 
              | P-Hydroxyphenylpyruvate Oxidase use 4-Hydroxyphenylpyruvate Dioxygenase | 
              | p-Methoxy-N-methylphenethylamine | 
              | p-Octopamine use Octopamine | 
              | P-Selectin | 
              | P-Type Calcium Channels use Calcium Channels, P-Type | 
              | P0 Glycoprotein use Myelin P0 Protein | 
              | P0 Protein use Myelin P0 Protein | 
              | P1 Bacteriophage Artificial Chromosomes use Chromosomes, Artificial, P1 Bacteriophage | 
              | P1 Phage use Bacteriophage P1 | 
              | P1 Purinoceptors use Receptors, Purinergic P1 | 
              | p100-GAP Protein use p120 GTPase Activating Protein | 
              | p105-Rb Protein use Retinoblastoma Protein | 
              | p120 GTPase Activating Protein | 
              | p120-GAP Protein use p120 GTPase Activating Protein | 
              | p125-GAP Protein use p120 GTPase Activating Protein | 
              | p145(c-kit) use Proto-Oncogene Proteins c-kit | 
              | p14ARF Protein use Tumor Suppressor Protein p14ARF | 
              | p150,95 Antigen use Integrin alphaXbeta2 | 
              | p16 Genes use Genes, p16 | 
              | p16INK4 Genes use Genes, p16 | 
              | P2 Phage use Bacteriophage P2 | 
              | P2 Purinoceptors use Receptors, Purinergic P2 | 
              | p21 cdc42 use cdc42 GTP-Binding Protein | 
              | p21(c-Ha-ras) use Proto-Oncogene Proteins p21(ras) | 
              | p21(c-Ki-ras) use Proto-Oncogene Proteins p21(ras) | 
              | p21(c-ras) use Proto-Oncogene Proteins p21(ras) | 
              | p21(N-ras) use Proto-Oncogene Proteins p21(ras) | 
              | p21(ras) use Proto-Oncogene Proteins p21(ras) | 
              | p21(v-Ha-ras) use Oncogene Protein p21(ras) | 
              | p21(v-Ki-ras) use Oncogene Protein p21(ras) | 
              | p21-Activated Kinases | 
              | P22 Phage use Bacteriophage P22 | 
              | p24(HIV) use HIV Core Protein p24 | 
              | p27(rex) use Gene Products, rex | 
              | p28(v-sis) use Oncogene Proteins v-sis | 
              | P300 Event-Related Potentials use Event-Related Potentials, P300 | 
              | p300-CBP Transcription Factors | 
              | p34cdc2 Protein use CDC2 Protein Kinase | 
              | p37(v-mos) use Oncogene Proteins v-mos | 
              | p38 Mitogen-Activated Protein Kinases | 
              | P388D(1) Leukemia use Leukemia P388 | 
              | p39(c-jun) use Proto-Oncogene Proteins c-jun | 
              | P40 T-Cell Growth Factor use Interleukin-9 | 
              | p40(tax) use Gene Products, tax | 
              | p42 MAP Kinase use Mitogen-Activated Protein Kinase 1 | 
              | p42 MAPK use Mitogen-Activated Protein Kinase 1 | 
              | p42(Mitogen-Activated Protein Kinase) use Mitogen-Activated Protein Kinase 1 | 
              | P450(c17) use Steroid 17-alpha-Hydroxylase | 
              | p48(v-myb) use Oncogene Proteins v-myb | 
              | p53 Genes use Genes, p53 | 
              | p53 Tumor Suppressor Protein use Tumor Suppressor Protein p53 | 
              | p55(c-fos) use Proto-Oncogene Proteins c-fos | 
              | p55(v-fos) use Oncogene Proteins v-fos | 
              | p55(v-myc) use Oncogene Protein p55(v-myc) | 
              | p56 lck use Lymphocyte Specific Protein Tyrosine Kinase p56(lck) | 
              | p62(c-myc) use Proto-Oncogene Proteins c-myc | 
              | p65(gag-jun) use Oncogene Protein p65(gag-jun) | 
              | p68 Kinase use eIF-2 Kinase | 
              | p68(c-rel) use Proto-Oncogene Proteins c-rel | 
              | p70 S6 Kinase use Ribosomal Protein S6 Kinases, 70-kDa | 
              | p70s6k use Ribosomal Protein S6 Kinases, 70-kDa | 
              | p75(gag-fos-fox) use Oncogene Proteins v-fos | 
              | p85(gag-mos) use Oncogene Proteins v-mos | 
              | PABA use 4-Aminobenzoic Acid | 
              | PACAP Receptors use Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide | 
              | PACAP Receptors, Type I use Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I | 
              | Pacemaker, Artificial | 
              | Pacemakers, Biological use Biological Clocks | 
              | Pachira use Bombacaceae | 
              | Pachycarpine use Sparteine | 
              | Pachydermatocele use Neurofibroma, Plexiform | 
              | Pachydermoperiostosis use Osteoarthropathy, Primary Hypertrophic | 
              | Pachygyria use Lissencephaly | 
              | Pachymeningitis use Meningitis | 
              | Pachyonychia Congenita | 
              | Pachyonychia Congenita Type 1 use Pachyonychia Congenita | 
              | Pachyonychia Congenita, Type 1 use Pachyonychia Congenita | 
              | Pachyonychia Congenita, Type 2 use Pachyonychia Congenita | 
              | Pachyrhizus | 
              | Pachyrhizus thunbergianus use Pueraria | 
              | Pachysandra | 
              | Pachytene Stage | 
              | Pacific Island Americans use Oceanic Ancestry Group | 
              | Pacific Islands | 
              | Pacific Northwest use Northwestern United States | 
              | Pacific Ocean | 
              | Pacific States | 
              | Pacifiers | 
              | Pacing, Cardiac, Artificial use Cardiac Pacing, Artificial | 
              | Pacinian Corpuscles | 
              | Pack Ice use Ice Barrier | 
              | Package Inserts use Product Labeling | 
              | Package Inserts for the Patient | 
              | Package Inserts, Drug use Drug Labeling | 
              | Packaging, Drug use Drug Packaging | 
              | Packaging, Food use Food Packaging | 
              | Packaging, Product use Product Packaging | 
              | Packaging, Viral use Virus Assembly | 
              | Packed Red-Cell Volume use Hematocrit | 
              | Packers use Packing Industry | 
              | Packing Industry | 
              | Packing of Equipment and Supplies use Equipment and Supplies Packing | 
              | Packing of Tobacco-Derived Products use Tobacco-Derived Products Packing | 
              | Paclitaxel | 
              | PACS (Radiology) use Radiology Information Systems | 
              | Pact use Treaties | 
              | Pactamycin | 
              | Padus avium use Prunus padus | 
              | Paecilomyces | 
              | Paenibacillus | 
              | Paeonia | 
              | Paeonia officinalis | 
              | Paeoniae Radix use Paeonia | 
              | Paepalanthus use Eriocaulaceae | 
              | PAF Acetylhydrolase use 1-Alkyl-2-acetylglycerophosphocholine Esterase | 
              | PAF-Acether use Platelet Activating Factor | 
              | Paget Disease Extramammary use Paget Disease, Extramammary | 
              | Paget Disease, Extramammary | 
              | Paget's Disease of Bone use Osteitis Deformans | 
              | Paget's Disease of Breast use Paget's Disease, Mammary | 
              | Paget's Disease, Extramammary use Paget Disease, Extramammary | 
              | Paget's Disease, Mammary | 
              | Paget-Schroetter Syndrome use Upper Extremity Deep Vein Thrombosis | 
              | Pagetoid Reticulosis | 
              | Pagoda Dogwoods use Cornus alternifolia | 
              | Pagophilus groenlandicus use Seals, Earless | 
              | Pagurus use Anomura | 
              | PAHO use Pan American Health Organization | 
              | PAHO Directing Council | 
              | PAHO Ethics Review Committee use Ethical Review Committee on Research | 
              | PAHO Executive Committee | 
              | PAHO Regional Centers | 
              | PAHOERC use Ethical Review Committee on Research | 
              | PAI-1 use Plasminogen Activator Inhibitor 1 | 
              | PAI-2 use Plasminogen Activator Inhibitor 2 | 
              | PAI-3 use Protein C Inhibitor | 
              | Pain | 
              | Pain Assessment use Pain Measurement | 
              | Pain Centers use Pain Clinics | 
              | Pain Clinics | 
              | Pain Disorder use Somatoform Disorders | 
              | Pain Indifference, Congenital use Pain Insensitivity, Congenital | 
              | Pain Insensitivity with Anhidrosis, Congenital use Hereditary Sensory and Autonomic Neuropathies | 
              | Pain Insensitivity, Congenital | 
              | Pain Management | 
              | Pain Measurement | 
              | Pain Perception | 
              | Pain Receptors use Nociceptors | 
              | Pain Relief Units use Pain Clinics | 
              | Pain Syndrome Type I, Regional, Complex use Reflex Sympathetic Dystrophy | 
              | Pain Syndromes, Regional Complex use Complex Regional Pain Syndromes | 
              | Pain Threshold | 
              | Pain, Facial use Facial Pain | 
              | Pain, Intractable | 
              | Pain, Menstrual use Dysmenorrhea | 
              | Pain, Postoperative | 
              | Pain, Referred | 
              | Paint | 
              | Paintbrush, Indian use Acanthaceae | 
              | Painted Coral Snake use Elaps corallinus | 
              | Painting Industry | 
              | Paintings | 
              | Pair Bond | 
              | Paired Box Transcription Factors | 
              | Paired-Associate Learning | 
              | Pakistan | 
              | Pakur use Ficus religiosa | 
              | Palaemon use Palaemonidae | 
              | Palaemonetes use Palaemonidae | 
              | Palaemonidae | 
              | Palaeognathae | 
              | Palaquium | 
              | Palatal Expansion Technique | 
              | Palatal Muscles | 
              | Palatal Neoplasms | 
              | Palatal Obturators | 
              | Palate | 
              | Palate, Hard | 
              | Palate, Soft | 
              | Palatine Bone use Palate, Hard | 
              | Palatine Tonsil | 
              | Palatopharyngeal Incompetence use Velopharyngeal Insufficiency | 
              | Palatopharyngeal Sphincter use Velopharyngeal Sphincter | 
              | Palatopharyngeus use Pharyngeal Muscles | 
              | Palau | 
              | Paleodontology | 
              | Paleography | 
              | Paleontology | 
              | Paleopathology | 
              | Paleostriatum use Globus Pallidus | 
              | Palestinians use Arabs | 
              | Palicourea use Rubiaceae | 
              | Palinuridae | 
              | Palladium | 
              | Palladium Metallicum | 
              | Palliative Care | 
              | Palliative Care Nursing use Hospice and Palliative Care Nursing | 
              | Palliative Medicine | 
              | Palliative Treatment use Palliative Care | 
              | Pallidotomy | 
              | Pallister-Hall Syndrome | 
              | Pallor | 
              | Palm Fat use Vegetable Fats | 
              | Palm Oil | 
              | Palm, Cycad use Cycas | 
              | Palm, False Sago use Cycas | 
              | Palm, Peach use Arecaceae | 
              | Palm, Rattan use Calamus | 
              | Palm-Leaf Reaction use Cervix Mucus | 
              | Palmar Carpal Ligament use Volar Plate | 
              | Palmar Ligaments use Volar Plate | 
              | Palmar Plate use Volar Plate | 
              | Palmer Index | 
              | Palmitates | 
              | Palmitic Acid | 
              | Palmitic Acids | 
              | Palmitoyl CoA use Palmitoyl Coenzyme A | 
              | Palmitoyl CoA Deacylase use Palmitoyl-CoA Hydrolase | 
              | Palmitoyl Coenzyme A | 
              | Palmitoyl Coenzyme A Hydrolase use Palmitoyl-CoA Hydrolase | 
              | Palmitoyl Thioesterase use Palmitoyl-CoA Hydrolase | 
              | Palmitoyl-CoA Hydrolase | 
              | Palmitoylation use Lipoylation | 
              | Palmitoylcarnitine | 
              | Palmitylcarnitine use Palmitoylcarnitine | 
              | Palmoplantar Keratoderma use Keratoderma, Palmoplantar | 
              | Palmoplantaris Pustulosis use Psoriasis | 
              | Paloondo | 
              | Palpation | 
              | Palpebral Conjunctiva use Conjunctiva | 
              | Palsy use Paralysis | 
              | Palyam Virus | 
              | Pambotano use Calliandra houstoni | 
              | Pamphlets | 
              | Pan American Center for Sanitary Engineering and Environmental Sciences use REPIDISCA | 
              | Pan American Foot-and-Mouth Disease Center | 
              | Pan American Health Organization | 
              | Pan American Health Organization Ethics Review Committee use Ethical Review Committee on Research | 
              | Pan American Sanitary Conference | 
              | Pan paniscus | 
              | Pan troglodytes | 
              | Panacea arvensis | 
              | Panaeolus papilionaceus use Agaricus campanulatus | 
              | Panaeolus sphinctrinus use Agaricus campanulatus | 
              | PANAFTOSA use Pan American Foot-and-Mouth Disease Center | 
              | Panama | 
              | Panama Canal Zone | 
              | Panamerican Information and Documentation Network on Sanitary Engineering and Environmental Sciences use REPIDISCA | 
              | Panax | 
              | Panax ginseng use Panax | 
              | Panax notoginseng | 
              | Panax quinquefolia use Ginseng (Homeopathy) | 
              | Panax quinquefolius use Ginseng (Homeopathy) | 
              | Panaxosides use Ginsenosides | 
              | Pancoast Syndrome | 
              | Pancreas | 
              | Pancreas Transplantation | 
              | Pancreas, Artificial | 
              | Pancreas, Artificial Endocrine use Insulin Infusion Systems | 
              | Pancreas, Endocrine use Islets of Langerhans | 
              | Pancreas, Exocrine | 
              | Pancreatectomy | 
              | Pancreatic alpha Cells use Glucagon-Secreting Cells | 
              | Pancreatic alpha-Amylases | 
              | Pancreatic beta Cells use Insulin-Secreting Cells | 
              | Pancreatic Cancer use Pancreatic Neoplasms | 
              | Pancreatic Cholera use Vipoma | 
              | Pancreatic Cyst | 
              | Pancreatic delta Cells use Somatostatin-Secreting Cells | 
              | Pancreatic Diseases | 
              | Pancreatic Ductal Carcinoma use Carcinoma, Pancreatic Ductal | 
              | Pancreatic Ducts | 
              | Pancreatic Elastase | 
              | Pancreatic Extracts | 
              | Pancreatic Fistula | 
              | Pancreatic Function Tests | 
              | Pancreatic Hormone Receptors use Receptors, Pancreatic Hormone | 
              | Pancreatic Hormones | 
              | Pancreatic Insufficiency use Exocrine Pancreatic Insufficiency | 
              | Pancreatic Islets use Islets of Langerhans | 
              | Pancreatic Islets Transplantation use Islets of Langerhans Transplantation | 
              | Pancreatic Juice | 
              | Pancreatic Kallikrein use Tissue Kallikreins | 
              | Pancreatic Necrosis Virus, Infectious use Infectious pancreatic necrosis virus | 
              | Pancreatic Neoplasms | 
              | Pancreatic Polypeptide | 
              | Pancreatic Polypeptide-Secreting Cells | 
              | Pancreatic Pseudocyst | 
              | Pancreatic Secretory Trypsin Inhibitor, Kazal use Trypsin Inhibitor, Kazal Pancreatic | 
              | Pancreatic Stellate Cells | 
              | Pancreatic Stone Protein use Lithostathine | 
              | Pancreatic Trypsin Secretory Inhibitor, Kazal use Trypsin Inhibitor, Kazal Pancreatic | 
              | Pancreaticoduodenectomy | 
              | Pancreaticojejunostomy | 
              | Pancreatin | 
              | Pancreatinum | 
              | Pancreatitis | 
              | Pancreatitis, Acute Necrotizing | 
              | Pancreatitis, Alcoholic | 
              | Pancreatitis, Chronic | 
              | Pancreatitis, Graft | 
              | Pancreatoduodenectomy use Pancreaticoduodenectomy | 
              | Pancreatojejunostomy use Pancreaticojejunostomy | 
              | Pancreatopeptidase use Pancreatic Elastase | 
              | Pancrein use Pancreatinum | 
              | Pancrelipase | 
              | Pancreozymin use Cholecystokinin | 
              | Pancreozymin Receptors use Receptors, Cholecystokinin | 
              | Pancuronium | 
              | Pancytopenia | 
              | Pandalidae | 
              | Pandalus use Pandalidae | 
              | Pandanaceae | 
              | Pandanus use Pandanaceae | 
              | Pandas, Giant use Ursidae | 
              | Pandas, Greater use Ursidae | 
              | Pandas, Lesser use Ailuridae | 
              | Pandemics | 
              | Panencephalitis, Subacute Sclerosing use Subacute Sclerosing Panencephalitis | 
              | Paneth Cells | 
              | Panic | 
              | Panic Attacks use Panic Disorder | 
              | Panic Disorder | 
              | Panicgrass use Panicum | 
              | Panicovirus use Tombusviridae | 
              | Panicum | 
              | Panleukopenia, Feline use Feline Panleukopenia | 
              | Panna | 
              | Panniculitis | 
              | Panniculitis, Lupus Erythematosus | 
              | Panniculitis, Nodular Nonsuppurative | 
              | Panniculitis, Peritoneal | 
              | Panniculitis, Subacute Nodular Migratory use Panniculitis | 
              | Panophthalmitis | 
              | Panoramic Radiography use Radiography, Panoramic | 
              | Pansporablastina | 
              | Panstrongylus | 
              | Pansy use Viola | 
              | Pantetheine | 
              | Panther Cap use Agaricus pantherinus | 
              | Panthera | 
              | Panthera leo use Lions | 
              | Panthera tigris use Tigers | 
              | Pantherine use Muscimol | 
              | Pantoea | 
              | Pantoea agglomerans use Pantoea | 
              | Pantomography use Radiography, Panoramic | 
              | Pantothenate Kinase-Associated Neurodegeneration | 
              | Pantothenic Acid | 
              | Panulirus use Palinuridae | 
              | Panuveitis | 
              | Papain | 
              | Papal Cross Spider use Aranea diadema | 
              | Papanicolaou Smear use Papanicolaou Test | 
              | Papanicolaou Test | 
              | Papaver | 
              | Papaver cornicatum luteum use Chelidonium majus | 
              | Papaver somniferum use Opium (Homeopathy) | 
              | Papaveraceae | 
              | Papaveretum use Opium | 
              | Papaverine | 
              | Papaverinum | 
              | Papaya use Carica | 
              | Papaya vulgaris use Asimina triloba | 
              | Paper | 
              | Paper Spurge use Euphorbia lathyris | 
              | Paper Waste use Solid Waste Recipients | 
              | Paperbark use Cajuputum | 
              | Papillary Muscles | 
              | Papilledema | 
              | Papillitis, Optic use Papilledema | 
              | Papilloma | 
              | Papilloma Virus DNA Probes use DNA Probes, HPV | 
              | Papilloma Virus, Shope use Cottontail rabbit papillomavirus | 
              | Papilloma, Choroid Plexus | 
              | Papilloma, Intraductal | 
              | Papilloma, Inverted | 
              | Papilloma, Shope use Tumor Virus Infections | 
              | Papilloma, Squamous Cell use Papilloma | 
              | Papillomatosis use Papilloma | 
              | Papillomaviridae | 
              | Papillomavirus E7 Proteins | 
              | Papillomavirus Infections | 
              | Papillomavirus sylvilagi use Cottontail rabbit papillomavirus | 
              | Papillomavirus Vaccines | 
              | Papillon-Leage and Psaume Syndrome use Orofaciodigital Syndromes | 
              | Papillon-Lefevre Disease | 
              | Papio | 
              | Papio anubis | 
              | Papio cynocephalus | 
              | Papio hamadryas | 
              | Papio papio | 
              | Papio ursinus | 
              | Papoose Root use Caulophyllum thalictroides | 
              | PAPP-A use Pregnancy-Associated Plasma Protein-A | 
              | Pappataci Fever use Phlebotomus Fever | 
              | Paprika use Capsicum | 
              | Papua New Guinea | 
              | Papular Mucinosis use Scleromyxedema | 
              | Papulosquamous Disorders use Skin Diseases, Papulosquamous | 
              | PAR-1 Receptor use Receptor, PAR-1 | 
              | PAR-2 Receptor use Receptor, PAR-2 | 
              | para-Aminoazobenzene use p-Aminoazobenzene | 
              | para-Aminobenzoates | 
              | para-Aminobenzoic Acid use 4-Aminobenzoic Acid | 
              | para-Aminohippuric Acid use p-Aminohippuric Acid | 
              | para-Aminosalicylic Acid use Aminosalicylic Acid | 
              | Para-Aortic Bodies | 
              | para-Azobenzenearsonate use p-Azobenzenearsonate | 
              | para-Bromdylamine use Brompheniramine | 
              | para-Chloroamphetamine use p-Chloroamphetamine | 
              | para-Chlorophenylalanine use Fenclonine | 
              | para-Dihydroxybenzenes use Hydroquinones | 
              | para-Fluorophenylalanine use p-Fluorophenylalanine | 
              | para-Hydroxyamphetamine use p-Hydroxyamphetamine | 
              | para-Hydroxybenzoate Hydroxylase use 4-Hydroxybenzoate-3-Monooxygenase | 
              | para-Hydroxybenzoic Acids use Parabens | 
              | para-Hydroxynorephedrine use p-Hydroxynorephedrine | 
              | para-Hydroxyphenylpyruvate Hydroxylase use 4-Hydroxyphenylpyruvate Dioxygenase | 
              | para-Hydroxyphenylpyruvate Oxidase use 4-Hydroxyphenylpyruvate Dioxygenase | 
              | para-Octopamine use Octopamine | 
              | Parabasalidea | 
              | Parabens | 
              | Parabiosis | 
              | Parabrachial Nucleus | 
              | Paracentesis | 
              | Paracentral Thalamic Nucleus use Intralaminar Thalamic Nuclei | 
              | Paracentrotus | 
              | Paracetamol use Acetaminophen | 
              | Parachlamydiaceae use Chlamydiales | 
              | Parachloramine use Meclizine | 
              | Parachuting use Aviation | 
              | Paracoccidioides | 
              | Paracoccidioidomycosis | 
              | Paracoccus | 
              | Paracoccus denitrificans | 
              | Paracoccus pantotrophus | 
              | Paracolobactrum use Enterobacteriaceae | 
              | Paracress use Spilanthes oleracea | 
              | Paracrine Communication | 
              | Paracrine Peptide Factors use Intercellular Signaling Peptides and Proteins | 
              | Paracrine Protein Factors use Intercellular Signaling Peptides and Proteins | 
              | Paracrine Signaling use Paracrine Communication | 
              | Paradentium use Periodontium | 
              | Paradoxical Extensor Reflex, Great Toe use Reflex, Babinski | 
              | Paradoxical Sleep use Sleep, REM | 
              | Parafascicular Thalamic Nucleus use Intralaminar Thalamic Nuclei | 
              | Paraffin | 
              | Paraffin Embedding | 
              | Paraffin Jelly use Petrolatum | 
              | Paraffinum | 
              | Paraganglia, Chromaffin | 
              | Paraganglia, Nonchromaffin | 
              | Paraganglioma | 
              | Paraganglioma, Carotid Body use Carotid Body Tumor | 
              | Paraganglioma, Extra-Adrenal | 
              | Paraganglioma, Gangliocytic use Paraganglioma | 
              | Paraganglioma, Nonchromaffin use Paraganglioma, Extra-Adrenal | 
              | Parageusia use Dysgeusia | 
              | Paragonimiasis | 
              | Paragonimus | 
              | Paragonimus westermani | 
              | Paragrapher | 
              | Paraguay | 
              | Parahemophilia use Factor V Deficiency | 
              | Parahippocampal Gyrus | 
              | Paraimmunoglobulinemias use Paraproteinemias | 
              | Parainfluenza use Paramyxoviridae Infections | 
              | Parainfluenza Vaccines | 
              | Parainfluenza Virus 1, Human | 
              | Parainfluenza Virus 2, Human | 
              | Parainfluenza Virus 3, Bovine | 
              | Parainfluenza Virus 3, Human | 
              | Parainfluenza Virus 4, Human | 
              | Parainfluenza Virus 5 | 
              | Parainfluenza Virus Infections use Paramyxoviridae Infections | 
              | Parakeets | 
              | Parakeratosis | 
              | Parakeratosis Variegata use Parapsoriasis | 
              | Paraldehyde | 
              | Paralithodes use Anomura | 
              | Parallax, Ocular use Vision Disparity | 
              | Parallel Lagoons | 
              | Paralyses, Familial Periodic | 
              | Paralysis | 
              | Paralysis Agitans use Parkinson Disease | 
              | Paralysis, Bulbar use Bulbar Palsy, Progressive | 
              | Paralysis, Hyperkalemic Periodic | 
              | Paralysis, Hypokalemic Periodic use Hypokalemic Periodic Paralysis | 
              | Paralysis, Lower Extremities use Paraplegia | 
              | Paralysis, Obstetric | 
              | Paralysis, Periodic, Hyperkalemic, Familial use Paralysis, Hyperkalemic Periodic | 
              | Paralysis, Pseudobulbar use Pseudobulbar Palsy | 
              | Paralysis, Respiratory Muscle use Respiratory Paralysis | 
              | Paralysis, Sleep use Sleep Paralysis | 
              | Paralytic Ileus use Intestinal Pseudo-Obstruction | 
              | Paramagnetic Resonance use Electron Spin Resonance Spectroscopy | 
              | Paramecium | 
              | Paramecium aurelia | 
              | Paramecium caudatum | 
              | Paramecium tetraurelia | 
              | Paramedical Personnel use Allied Health Personnel | 
              | Paramedics use Allied Health Personnel | 
              | Paramedics, Emergency use Emergency Medical Technicians | 
              | Parameters | 
              | Paramethasone | 
              | Parametritis | 
              | Paramorphan use Dihydromorphine | 
              | Paramphistomata use Paramphistomatidae | 
              | Paramphistomatidae | 
              | Paramphistomum use Paramphistomatidae | 
              | Paramyosin use Tropomyosin | 
              | Paramyotonia Congenita use Myotonic Disorders | 
              | Paramyxoviridae | 
              | Paramyxoviridae Infections | 
              | Paramyxovirinae | 
              | Paramyxovirus 1, Avian use Newcastle disease virus | 
              | Paramyxoviruses, Avian use Avulavirus | 
              | Paranasal Sinus Diseases | 
              | Paranasal Sinus Neoplasms | 
              | Paranasal Sinus-Nasal Cavity Esthesioneuroblastoma use Esthesioneuroblastoma, Olfactory | 
              | Paranasal Sinuses | 
              | Paraneoplastic Autonomic Dysfunction use Paraneoplastic Syndromes, Nervous System | 
              | Paraneoplastic Cerebellar Degeneration | 
              | Paraneoplastic Cerebellar Degeneration, Anti-Yo-Associated use Paraneoplastic Cerebellar Degeneration | 
              | Paraneoplastic Encephalomyelitis use Paraneoplastic Syndromes, Nervous System | 
              | Paraneoplastic Endocrine Syndromes | 
              | Paraneoplastic Limbic Encephalitis use Limbic Encephalitis | 
              | Paraneoplastic Opsoclonus-Myoclonus Ataxia use Opsoclonus-Myoclonus Syndrome | 
              | Paraneoplastic Peripheral Neuropathy use Paraneoplastic Polyneuropathy | 
              | Paraneoplastic Polyneuropathy | 
              | Paraneoplastic Syndromes | 
              | Paraneoplastic Syndromes, Nervous System | 
              | Paraneoplastic Syndromes, Ocular | 
              | Paranoia use Paranoid Disorders | 
              | Paranoid Behavior | 
              | Paranoid Disorder, Shared use Shared Paranoid Disorder | 
              | Paranoid Disorders | 
              | Paranoid Personality Disorder | 
              | Paranoid Psychoses use Paranoid Disorders | 
              | Paranoid Schizophrenia use Schizophrenia, Paranoid | 
              | Paraosmia use Olfaction Disorders | 
              | Paraoxon | 
              | Paraparesis | 
              | Paraparesis, Spastic | 
              | Paraparesis, Tropical Spastic | 
              | Paraphenylendiaminum | 
              | Paraphenylenum Diaminum use Paraphenylendiaminum | 
              | Paraphilias | 
              | Paraphimosis | 
              | Paraphrenia, Involutional use Depressive Disorder, Major | 
              | Paraplegia | 
              | Paraplegia, Spastic use Paraplegia | 
              | Parapoxvirus | 
              | Paraproteinemias | 
              | Paraproteins | 
              | Parapsoriasis | 
              | Parapsoriasis en Plaques use Parapsoriasis | 
              | Parapsychology | 
              | Paraquat | 
              | Parascaris use Ascaridoidea | 
              | Parasite Chain use Food Chain | 
              | Parasite Egg Count | 
              | Parasite Load | 
              | Parasite-Host Relations use Host-Parasite Interactions | 
              | Parasitemia | 
              | Parasites | 
              | Parasitic Diseases | 
              | Parasitic Diseases, Animal | 
              | Parasitic Eye Infections use Eye Infections, Parasitic | 
              | Parasitic Infections, Central Nervous System use Central Nervous System Parasitic Infections | 
              | Parasitic Intestinal Diseases use Intestinal Diseases, Parasitic | 
              | Parasitic Liver Diseases use Liver Diseases, Parasitic | 
              | Parasitic Lung Diseases use Lung Diseases, Parasitic | 
              | Parasitic Pregnancy Complications use Pregnancy Complications, Parasitic | 
              | Parasitic Sensitivity Tests | 
              | Parasitic Skin Diseases use Skin Diseases, Parasitic | 
              | Parasitic Worm Infections use Helminthiasis | 
              | Parasitic Worm Infestations use Helminthiasis | 
              | Parasitic Worms use Helminths | 
              | Parasiticides use Antiparasitic Agents | 
              | Parasitological Analysis | 
              | Parasitology | 
              | Parasol Mushroom use Agaricus procerus | 
              | Parasomnias | 
              | Parasomnias, REM Sleep use REM Sleep Parasomnias | 
              | Paraspinal Muscles | 
              | Parasuicide use Self-Injurious Behavior | 
              | Parasympathectomy | 
              | Parasympathetic Denervation use Parasympathectomy | 
              | Parasympathetic Fibers, Postganglionic | 
              | Parasympathetic Ganglia use Ganglia, Parasympathetic | 
              | Parasympathetic Nervous System | 
              | Parasympathetic Nervous System Diseases use Autonomic Nervous System Diseases | 
              | Parasympathetic-Blocking Agents use Parasympatholytics | 
              | Parasympatholytics | 
              | Parasympathomimetics | 
              | Parasystole | 
              | Paratenial Thalamic Nucleus use Midline Thalamic Nuclei | 
              | Parathion | 
              | Parathion Methyl use Methyl Parathion | 
              | Parathormonum use Parathyreoidinum | 
              | Parathyreoidinum | 
              | Parathyroid Cancer use Parathyroid Neoplasms | 
              | Parathyroid Diseases | 
              | Parathyroid Glands | 
              | Parathyroid Hormone | 
              | Parathyroid Hormone Receptor 2 use Receptor, Parathyroid Hormone, Type 2 | 
              | Parathyroid Hormone Receptor Type 1 use Receptor, Parathyroid Hormone, Type 1 | 
              | Parathyroid Hormone Receptors use Receptors, Parathyroid Hormone | 
              | Parathyroid Hormone-Related Protein | 
              | Parathyroid Neoplasms | 
              | Parathyroidectomy | 
              | Paratopes use Binding Sites, Antibody | 
              | Paratuberculosis | 
              | Paratyphoid Fever | 
              | Paratyphoid Vaccine use Typhoid-Paratyphoid Vaccines | 
              | Paratyphoidinum | 
              | Paravaccinia virus use Pseudocowpox virus | 
              | Paraventricular Hypothalamic Nucleus | 
              | Paraventricular Thalamic Nucleus use Midline Thalamic Nuclei | 
              | parC Protein use DNA Topoisomerase IV | 
              | parE Protein use DNA Topoisomerase IV | 
              | Parechovirus | 
              | Pareira brava | 
              | Parent, Single use Single Parent | 
              | Parent-Child Relations | 
              | Parental Consent | 
              | Parental Death | 
              | Parental Imprinting use Genomic Imprinting | 
              | Parental Leave | 
              | Parental Notification | 
              | Parental Responsibility use Parenting | 
              | Parenteral Feeding use Parenteral Nutrition | 
              | Parenteral Feeding, Home use Parenteral Nutrition, Home | 
              | Parenteral Hyperalimentation use Parenteral Nutrition, Total | 
              | Parenteral Infusions use Infusions, Parenteral | 
              | Parenteral Nutrition | 
              | Parenteral Nutrition Solutions | 
              | Parenteral Nutrition, Home | 
              | Parenteral Nutrition, Home Total | 
              | Parenteral Nutrition, Total | 
              | Parenterally-Transmitted Non-A, Non-B Hepatitis use Hepatitis C | 
              | Parenthood use Parenting | 
              | Parenting | 
              | Parents | 
              | Paresis | 
              | Paresthesia | 
              | Paretic Neurosyphilis use Neurosyphilis | 
              | Pargyline | 
              | Parietal Bone | 
              | Parietal Cells, Gastric | 
              | Parietal Lobe | 
              | Parietal Peritoneum use Peritoneum | 
              | Parietal Region Trauma use Craniocerebral Trauma | 
              | Parietaria | 
              | Parietaria officinalis | 
              | Parilla, Yellow use Menispermum | 
              | Parinaud Syndrome use Ocular Motility Disorders | 
              | Paris | 
              | Paris quadrifolia | 
              | Parish Nursing | 
              | Parish Register use Civil Registration | 
              | Parity | 
              | Parking Facilities | 
              | Parkinson Disease | 
              | Parkinson Disease, Postencephalitic | 
              | Parkinson Disease, Secondary | 
              | Parkinsonian Disorders | 
              | Parkinsonian Syndrome use Parkinsonian Disorders | 
              | Parkinsonism use Parkinsonian Disorders | 
              | Parkinsonism, Experimental use Parkinsonian Disorders | 
              | Parkinsonism, Juvenile use Parkinsonian Disorders | 
              | Parkinsonism, Viral Meningoencephalitic use Parkinson Disease, Postencephalitic | 
              | Parks and Gardens use Green Areas | 
              | Parliament use Legislative | 
              | Parodontium use Periodontium | 
              | Parodontosis use Periodontal Diseases | 
              | Paromomycin | 
              | Paronychia | 
              | Paronychia illecebrum | 
              | Parotid Cancer use Parotid Neoplasms | 
              | Parotid Diseases | 
              | Parotid Gland | 
              | Parotid Neoplasms | 
              | Parotid Region | 
              | Parotidinum | 
              | Parotitis | 
              | Parotitis, Epidemic use Mumps | 
              | Parovarian Cyst | 
              | Paroxetine | 
              | Paroxysmal Cold Hemoglobinuria use Hemoglobinuria, Paroxysmal | 
              | Paroxysmal Hemicrania | 
              | Paroxysmal Nerve Pain use Neuralgia | 
              | Paroxysmal Nocturnal Hemoglobinuria use Hemoglobinuria, Paroxysmal | 
              | Paroxysmal Sleep use Narcolepsy | 
              | Parrots | 
              | Pars Compacta | 
              | Pars Planitis | 
              | Pars Reticulata | 
              | Parshall Flume use Flowmeters | 
              | Parshall Meters use Flowmeters | 
              | Parsley use Petroselinum | 
              | Parsnip yellow fleck virus use Sequivirus | 
              | Parsnips use Pastinaca | 
              | Parsonage-Turner Syndrome use Brachial Plexus Neuritis | 
              | Parthenium hysterophorus | 
              | Parthenocissus quinquefolia use Ampelopsis quinquefolia | 
              | Parthenogenesis | 
              | Partial Epilepsy use Epilepsies, Partial | 
              | Partial Epilepsy, Motor use Epilepsy, Partial, Motor | 
              | Partial Epilepsy, Sensory use Epilepsy, Partial, Sensory | 
              | Partial Mastectomy use Mastectomy, Segmental | 
              | Partial Monosomy use Chromosome Deletion | 
              | Partial Pressure | 
              | Partial Seizure Disorder use Epilepsies, Partial | 
              | Partial Seizure Disorder, Motor use Epilepsy, Partial, Motor | 
              | Partial Tetrasomy use Tetrasomy | 
              | Partial Thromboplastin Time | 
              | Partial Trisomy use Trisomy | 
              | Participative Planning | 
              | Particle Accelerators | 
              | Particle Counting | 
              | Particle Interactions, Elementary use Elementary Particle Interactions | 
              | Particle Removal | 
              | Particle Size | 
              | Particle-Induced X-Ray Emission Spectrometry use Spectrometry, X-Ray Emission | 
              | Particle-Mediated Epidermal Delivery of DNA use Biolistics | 
              | Particles | 
              | Particulate Matter | 
              | Particulates use Particles | 
              | Partner Abuse use Spouse Abuse | 
              | Partner Notification use Contact Tracing | 
              | Partnership in Health use Health Consortia | 
              | Partnership Practice | 
              | Partnership Practice, Dental | 
              | Partridge Wood use Geoffroya vermifuga | 
              | Partridgepea use Chamaecrista | 
              | Parturient Paresis | 
              | Parturition | 
              | Parvalbumins | 
              | Parvocellular Oculomotor Nucleus use Edinger-Westphal Nucleus | 
              | Parvoviridae | 
              | Parvoviridae Infections | 
              | Parvovirinae | 
              | Parvovirus | 
              | Parvovirus B19, Human | 
              | Parvovirus H-1 use H-1 parvovirus | 
              | Parvovirus Infections use Parvoviridae Infections | 
              | Parvovirus, Canine | 
              | Parvovirus, Porcine | 
              | Parvovirus, Raccoon use Parvovirus | 
              | Parvovirus, Simian use Erythrovirus | 
              | Parvoviruses, Insect use Densovirus | 
              | PAS Reaction use Periodic Acid-Schiff Reaction | 
              | Paspalum | 
              | Pasqueflower use Pulsatilla | 
              | Passeridae use Sparrows | 
              | Passeriformes | 
              | Passiflora | 
              | Passiflora incarnata | 
              | Passifloraceae | 
              | Passion Flower use Passiflora | 
              | Passionfruit use Passiflora | 
              | Passive Addiction, Neonatal use Neonatal Abstinence Syndrome | 
              | Passive Antibody Transfer use Immunization, Passive | 
              | Passive Cutaneous Anaphylaxis | 
              | Passive Motion Therapy, Continuous use Motion Therapy, Continuous Passive | 
              | Passive Range of Motion use Range of Motion, Articular | 
              | Passive Smoking use Tobacco Smoke Pollution | 
              | Passive Transfer Experimental Autoimmune Myasthenia Gravis use Myasthenia Gravis, Autoimmune, Experimental | 
              | Passive Transfer of Immunity use Immunization, Passive | 
              | Passive Transfer Test use Intradermal Tests | 
              | Passive-Aggressive Personality Disorder | 
              | Passive-Dependent Personality use Dependent Personality Disorder | 
              | Pastas | 
              | Pastes use Ointments | 
              | Pasteurella | 
              | Pasteurella haemolytica use Mannheimia haemolytica | 
              | Pasteurella Infections | 
              | Pasteurella multocida | 
              | Pasteurella pestis use Yersinia pestis | 
              | Pasteurella pneumotropica | 
              | Pasteurella tularensis use Francisella tularensis | 
              | Pasteurellaceae | 
              | Pasteurellaceae Infections | 
              | Pasteurellosis use Pasteurella Infections | 
              | Pasteurellosis, Pneumonic | 
              | Pasteuria | 
              | Pasteurization | 
              | Pastille use Candies | 
              | Pastinaca | 
              | Pastinaca sativa | 
              | Pastoral Care | 
              | Pasture | 
              | Patas Monkey use Erythrocebus patas | 
              | Patch Tests | 
              | Patch-Clamp Techniques | 
              | Patella | 
              | Patellar Dislocation | 
              | Patellar Ligament | 
              | Patellar Tendon use Patellar Ligament | 
              | Patellofemoral Joint | 
              | Patellofemoral Pain Syndrome | 
              | Patency, Vascular use Vascular Patency | 
              | Patent Ductus Arteriosus Familial use Ductus Arteriosus, Patent | 
              | Patent Foramen Ovale use Foramen Ovale, Patent | 
              | Patent Indicators | 
              | Patent Medicines use Nonprescription Drugs | 
              | Patents | 
              | Patents as Topic | 
              | Paternal Age | 
              | Paternal Behavior | 
              | Paternal Deprivation | 
              | Paternal Exposure | 
              | Paternal Messenger RNA use RNA, Messenger, Stored | 
              | Paternalism | 
              | Paternity | 
              | Paternity Leave use Parental Leave | 
              | Paterson Intestinalis Bacillus use Bacillus Bach-Paterson | 
              | Patey Mastectomy use Mastectomy, Modified Radical | 
              | Pathogen-Free Organisms use Specific Pathogen-Free Organisms | 
              | Pathogenesis use Pathogenesis, Homeopathic | 
              | Pathogenesis, Homeopathic | 
              | Pathogenesy use Pathogenesis, Homeopathic | 
              | Pathogenesy, Homeopathic use Pathogenesis, Homeopathic | 
              | Pathogenetic Symptoms | 
              | Pathogenicity use Virulence | 
              | Pathogenicity Factors use Virulence Factors | 
              | Pathogenicity Islands use Genomic Islands | 
              | Pathogens, Blood-Borne use Blood-Borne Pathogens | 
              | Pathogeny, Homeopathic use Pathogenesis, Homeopathic | 
              | Pathologic Processes | 
              | Pathological Conditions, Anatomical | 
              | Pathological Conditions, Signs and Symptoms | 
              | Pathological Gambling use Gambling | 
              | Pathological Waste use Medical Waste | 
              | Pathology | 
              | Pathology Department, Hospital | 
              | Pathology, Clinical | 
              | Pathology, Forensic use Forensic Pathology | 
              | Pathology, Molecular | 
              | Pathology, Oral | 
              | Pathology, Surgical | 
              | Pathology, Veterinary | 
              | Patient Abandonment use Refusal to Treat | 
              | Patient Acceptance of Health Care | 
              | Patient Access to Records | 
              | Patient Acuity | 
              | Patient Adherence use Patient Compliance | 
              | Patient Admission | 
              | Patient Advocacy | 
              | Patient Agent use Proxy | 
              | Patient Appointments use Appointments and Schedules | 
              | Patient Care | 
              | Patient Care Bundles | 
              | Patient Care Episodes use Episode of Care | 
              | Patient Care Management | 
              | Patient Care Planning | 
              | Patient Care Team | 
              | Patient Compliance | 
              | Patient Cooperation use Patient Compliance | 
              | Patient Credit and Collection | 
              | Patient Data Privacy use Confidentiality | 
              | Patient Discharge | 
              | Patient Discharge Summaries | 
              | Patient Dropouts | 
              | Patient Dumping use Patient Transfer | 
              | Patient Education as Topic | 
              | Patient Education Handout | 
              | Patient Escort Service | 
              | Patient Freedom of Choice Laws | 
              | Patient Handoff | 
              | Patient Harm | 
              | Patient Holding Stretchers use Stretchers | 
              | Patient Identification Systems | 
              | Patient Individualization use Constitutional Diagnosis | 
              | Patient Isolation | 
              | Patient Isolators | 
              | Patient Medication Knowledge | 
              | Patient Monitoring use Monitoring, Physiologic | 
              | Patient Moving and Lifting use Moving and Lifting Patients | 
              | Patient Navigation | 
              | Patient Noncompliance use Patient Compliance | 
              | Patient Ombudsmen use Patient Advocacy | 
              | Patient Outcome Assessment | 
              | Patient Participation | 
              | Patient Positioning | 
              | Patient Preference | 
              | Patient Protection and Affordable Care Act | 
              | Patient Readmission | 
              | Patient Records, Computerized use Health Records, Personal | 
              | Patient Recruitment use Patient Selection | 
              | Patient Refusal of Treatment use Treatment Refusal | 
              | Patient Representatives use Patient Advocacy | 
              | Patient Rights | 
              | Patient Safety | 
              | Patient Satisfaction | 
              | Patient Schedules use Appointments and Schedules | 
              | Patient Selection | 
              | Patient Self-Determination Act | 
              | Patient Simulation | 
              | Patient Transfer | 
              | Patient-Centered Care | 
              | Patient-Centered Nursing use Patient-Centered Care | 
              | Patient-Family Lodging use Housing | 
              | Patient-Focused Care use Patient-Centered Care | 
              | Patient-Specific Modeling | 
              | Patients | 
              | Patients' Rooms | 
              | Patients' Visitors use Visitors to Patients | 
              | Patinopecten use Pectinidae | 
              | Patrinia | 
              | Pattern Recognition Receptors use Receptors, Pattern Recognition | 
              | Pattern Recognition, Automated | 
              | Pattern Recognition, Physiological | 
              | Pattern Recognition, Visual | 
              | Patulin | 
              | Pau d'arco use Tabebuia | 
              | Pauci-Immune Vasculitis use Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis | 
              | Paucibacillary Leprosy use Leprosy, Paucibacillary | 
              | Paul's Betony use Veronica officinalis | 
              | Paul-Bunnell Antibodies use Antibodies, Heterophile | 
              | Paul-Bunnell Antigens use Antigens, Heterophile | 
              | Paullinia | 
              | Paullinia cupana use Guarana (Homeopathy) | 
              | Paullinia pinnata | 
              | Paullinia sorbilis use Guarana (Homeopathy) | 
              | Pausinystalia | 
              | Pauson use Sanguinaria canadensis | 
              | Pavor Nocturnus use Night Terrors | 
              | Pawpaw use Asimina | 
              | PAX2 Transcription Factor | 
              | PAX7 Transcription Factor | 
              | PAX9 Transcription Factor | 
              | Paxillin | 
              | PC1 Prohormone Convertase use Proprotein Convertase 1 | 
              | PC12 Cells | 
              | PCA use Passive Cutaneous Anaphylaxis | 
              | PCBs use Polychlorinated Biphenyls | 
              | PCC Deficiency use Propionic Acidemia | 
              | PCMB use p-Chloromercuribenzoic Acid | 
              | PCMBS use 4-Chloromercuribenzenesulfonate | 
              | PCNA use Proliferating Cell Nuclear Antigen | 
              | PCP Abuse use Phencyclidine Abuse | 
              | PCP Receptors use Receptors, Phencyclidine | 
              | PCR use Polymerase Chain Reaction | 
              | PD-ECGF use Thymidine Phosphorylase | 
              | PDGF alpha Receptor use Receptor, Platelet-Derived Growth Factor alpha | 
              | PDGF beta Receptor use Receptor, Platelet-Derived Growth Factor beta | 
              | PDGF Receptors use Receptors, Platelet-Derived Growth Factor | 
              | PDGF-R-alpha use Receptor, Platelet-Derived Growth Factor alpha | 
              | PDGFB use Proto-Oncogene Proteins c-sis | 
              | PDGFR beta use Receptor, Platelet-Derived Growth Factor beta | 
              | PDH Phosphatase use Pyruvate Dehydrogenase (Lipoamide)-Phosphatase | 
              | PDZ Domains | 
              | Pea Plant, Pigeon use Cajanus | 
              | Pea, Partridge use Chamaecrista | 
              | Pea, Sensitive use Chamaecrista | 
              | Peace Corps | 
              | Peach use Prunus | 
              | Peach Palm use Arecaceae | 
              | Peach Tree use Prunus | 
              | Peak Expiratory Flow Rate | 
              | Peak Temperature | 
              | Peanut Agglutinin | 
              | Peanut Allergy use Peanut Hypersensitivity | 
              | Peanut Foods use Foods Containing Peanuts | 
              | Peanut Hypersensitivity | 
              | Peanut Lectin use Peanut Agglutinin | 
              | Peanut-Containing Foods use Foods Containing Peanuts | 
              | Peanut-Derived Food use Foods Containing Peanuts | 
              | Peanuts use Arachis hypogaea | 
              | Pears use Pyrus | 
              | Peas | 
              | Peashrub use Caragana | 
              | Peat use Soil | 
              | Peat Cutting Areas use Swamps | 
              | Peat Therapy use Mud Therapy | 
              | Peatlands use Swamps | 
              | PECAM-1 use Antigens, CD31 | 
              | Pecan Tree use Carya | 
              | Pecans use Carya | 
              | PEComas use Perivascular Epithelioid Cell Neoplasms | 
              | Pecten | 
              | Pecten jacobaeus | 
              | Pecten Oculi use Retinal Vessels | 
              | Pectin Depolymerase use Polygalacturonase | 
              | Pectinase use Polygalacturonase | 
              | Pectinatus | 
              | Pectinidae | 
              | Pectins | 
              | Pectobacterium | 
              | Pectobacterium carotovorum | 
              | Pectobacterium chrysanthemi | 
              | Pectoral Nerves use Thoracic Nerves | 
              | Pectoralis Muscles | 
              | Pectus Carinatum | 
              | Pectus Excavatum use Funnel Chest | 
              | Pedaliaceae | 
              | Pediatric Assistants | 
              | Pediatric Dentistry | 
              | Pediatric Intensive Care Units use Intensive Care Units, Pediatric | 
              | Pediatric Nurse Practitioners | 
              | Pediatric Nursing | 
              | Pediatric Obesity | 
              | Pediatric Psychology use Psychology, Child | 
              | Pediatrics | 
              | Pedicle Screws | 
              | Pedicularis | 
              | Pedicularis canadensis | 
              | Pediculosis use Lice Infestations | 
              | Pediculus | 
              | Pediculus capitis | 
              | Pedicure and Manicure Services use Beauty and Aesthetics Centers | 
              | Pedigree | 
              | Pediococcus | 
              | Pedobacter | 
              | Pedodontics use Pediatric Dentistry | 
              | Pedology use Edaphology | 
              | Pedophilia | 
              | Pedunculata use Thoracica | 
              | Pedunculopontine Tegmental Nucleus | 
              | PEEP, Intrinsic use Positive-Pressure Respiration, Intrinsic | 
              | PEEP, Occult use Positive-Pressure Respiration, Intrinsic | 
              | Peepul Tree use Ficus religiosa | 
              | Peer Group | 
              | Peer Review | 
              | Peer Review Organizations use Professional Review Organizations | 
              | Peer Review, Grants use Peer Review, Research | 
              | Peer Review, Health Care | 
              | Peer Review, Publishing use Peer Review, Research | 
              | Peer Review, Research | 
              | Pefloxacin | 
              | Pefudensovirus use Densovirinae | 
              | Peganum | 
              | Pejibaye use Arecaceae | 
              | Pelargonium | 
              | Pelargonium reniforme | 
              | Pelger-Huet Anomaly | 
              | Pelia berus use Vipera berus | 
              | Pelican-Flower use Serpentaria aristolochia | 
              | Peliosis Hepatis | 
              | Pelizaeus-Merzbacher Disease | 
              | Pellagra | 
              | Pelletierinum | 
              | Pellets, Drug use Drug Implants | 
              | Pellitory use Parietaria | 
              | Peloid Therapy use Mud Therapy | 
              | Pelophylax esculentus use Rana esculenta | 
              | Pelotherapy use Mud Therapy | 
              | Pelvic Bones | 
              | Pelvic Cancer use Pelvic Neoplasms | 
              | Pelvic Exenteration | 
              | Pelvic Floor | 
              | Pelvic Floor Disorders | 
              | Pelvic Girdle Pain | 
              | Pelvic Horn Syndrome use Nail-Patella Syndrome | 
              | Pelvic Infection | 
              | Pelvic Inflammatory Disease | 
              | Pelvic Neoplasms | 
              | Pelvic Organ Prolapse | 
              | Pelvic Pain | 
              | Pelvic Plexus use Hypogastric Plexus | 
              | Pelvic Pouches use Colonic Pouches | 
              | Pelvimetry | 
              | Pelvis | 
              | Pemba use Indian Ocean Islands | 
              | Pemoline | 
              | Pemphigoid use Pemphigoid, Bullous | 
              | Pemphigoid Gestationis | 
              | Pemphigoid, Benign Mucous Membrane | 
              | Pemphigoid, Bullous | 
              | Pemphigoid, Cicatricial use Pemphigoid, Benign Mucous Membrane | 
              | Pemphigus | 
              | Pemphigus Vulgaris use Pemphigus | 
              | Pemphigus, Benign Familial | 
              | Pempidine | 
              | Penaeidae | 
              | Penaeus use Penaeidae | 
              | Penal Centers use Prisons | 
              | Penal Institutions use Prisons | 
              | Penal Institutions Sanitation use Prison Sanitation | 
              | Penalties for Environmental Damages | 
              | Penbutolol | 
              | Pendular Migration | 
              | Pendular Nystagmus use Nystagmus, Pathologic | 
              | Penetrance | 
              | Penetrating Trauma use Wounds, Penetrating | 
              | Penfluridol | 
              | Penguins use Spheniscidae | 
              | Penicillamine | 
              | Penicillanic Acid | 
              | Penicillic Acid | 
              | Penicillin Acylase use Penicillin Amidase | 
              | Penicillin Amidase | 
              | Penicillin Amidohydrolase use Penicillin Amidase | 
              | Penicillin G | 
              | Penicillin G Benzathine | 
              | Penicillin G Procaine | 
              | Penicillin Resistance | 
              | Penicillin V | 
              | Penicillin, Aminobenzyl use Ampicillin | 
              | Penicillin, Dimethoxyphenyl use Methicillin | 
              | Penicillin, Methylphenylisoxazolyl use Oxacillin | 
              | Penicillin, Phenoxymethyl use Penicillin V | 
              | Penicillin-Binding Proteins | 
              | Penicillinase | 
              | Penicillins | 
              | Penicillinum | 
              | Penicillium | 
              | Penicillium chrysogenum | 
              | Penicillium notatum use Penicillium chrysogenum | 
              | Peniculina | 
              | Penile Cancer use Penile Neoplasms | 
              | Penile Diseases | 
              | Penile Erection | 
              | Penile Implantation | 
              | Penile Induration | 
              | Penile Neoplasms | 
              | Penile Prosthesis | 
              | Penile Prosthesis Implantation use Penile Implantation | 
              | Penis | 
              | Penis, Artificial use Penile Prosthesis | 
              | Peniseismic Zone | 
              | Pennisetum | 
              | Pennsylvania | 
              | Pennyroyal, American False use Hedeoma | 
              | Pennyroyal, European use Mentha pulegium | 
              | Pensions | 
              | Penstemon | 
              | Pentachlorophenol | 
              | Pentacyclic Triterpenes | 
              | Pentadienes use Alkadienes | 
              | Pentaerythritol Tetranicotinate use Niceritrol | 
              | Pentaerythritol Tetranitrate | 
              | Pentagastrin | 
              | Pentalogy of Cantrell | 
              | Pentamethylenetetrazole use Pentylenetetrazole | 
              | Pentamidine | 
              | Pentamidine Isethionate use Pentamidine | 
              | Pentanes | 
              | Pentanisia use Rubiaceae | 
              | Pentanoates use Valerates | 
              | Pentanoic Acids | 
              | Pentanols | 
              | Pentanones | 
              | Pentanucleotide Repeats use Microsatellite Repeats | 
              | Pentas use Rubiaceae | 
              | Pentastomida | 
              | Pentazocine | 
              | Pentenes use Alkenes | 
              | Pentetates use Pentetic Acid | 
              | Pentetic Acid | 
              | Pentetrazole use Pentylenetetrazole | 
              | Penthanil use Pentetic Acid | 
              | Penthiobarbital use Thiopental | 
              | Penthorum sedoides | 
              | Pentobarbital | 
              | Pentolinium Tartrate | 
              | Pentosan Polysulfate use Pentosan Sulfuric Polyester | 
              | Pentosan Sulfuric Polyester | 
              | Pentose Phosphate Pathway | 
              | Pentose Phosphate Shunt use Pentose Phosphate Pathway | 
              | Pentose Shunt use Pentose Phosphate Pathway | 
              | Pentosephosphate Pathway use Pentose Phosphate Pathway | 
              | Pentosephosphates | 
              | Pentoses | 
              | Pentostatin | 
              | Pentosyltransferases | 
              | Pentoxifylline | 
              | Pentoxyl | 
              | Pentoxyresorufin O-Dealkylase use Cytochrome P-450 CYP2B1 | 
              | Pentyl Alcohols use Pentanols | 
              | Pentylenetetrazole | 
              | Pentymal use Amobarbital | 
              | Peony use Paeonia | 
              | People with Disabilities use Disabled Persons | 
              | People's Republic of China use China | 
              | Peperomia | 
              | Pepleomycin use Peplomycin | 
              | Peplomycin | 
              | Pepper Tree use Schinus molle | 
              | Pepper, Ashanti use Piper | 
              | Pepper, Cubeb use Piper | 
              | Pepper, Jaborandi use Piper | 
              | Peppercorn tree use Schinus molle | 
              | Peppergrass use Lepidium sativum | 
              | Peppermint use Mentha piperita | 
              | Peppertree, Brazilian use Anacardiaceae | 
              | Peppertree, California use Anacardiaceae | 
              | Pepperweed use Lepidium sativum | 
              | Pepperwort use Marsileaceae | 
              | Pepsin use Pepsin A | 
              | Pepsin A | 
              | Pepsinogen use Pepsinogen A | 
              | Pepsinogen 3, Group I use Pepsinogen A | 
              | Pepsinogen 5, Group I use Pepsinogen A | 
              | Pepsinogen A | 
              | Pepsinogen B use Pepsinogens | 
              | Pepsinogen C | 
              | Pepsinogen I use Pepsinogen A | 
              | Pepsinogen II use Pepsinogen C | 
              | Pepsinogens | 
              | Pepstatins | 
              | Peptaibols | 
              | Peptic Ulcer | 
              | Peptic Ulcer Hemorrhage | 
              | Peptic Ulcer Perforation | 
              | Peptichemio | 
              | Peptidase Inhibitors use Protease Inhibitors | 
              | Peptidases use Peptide Hydrolases | 
              | Peptide Biosynthesis | 
              | Peptide Biosynthesis, Extra-Ribosomal use Peptide Biosynthesis, Nucleic Acid-Independent | 
              | Peptide Biosynthesis, Non-Ribosomal use Peptide Biosynthesis, Nucleic Acid-Independent | 
              | Peptide Biosynthesis, Nucleic Acid-Independent | 
              | Peptide Biosynthesis, Ribosomal use Protein Biosynthesis | 
              | Peptide Biosynthesis, Thiotemplate Mechanism use Peptide Biosynthesis, Nucleic Acid-Independent | 
              | Peptide Chain Elongation, Translational | 
              | Peptide Chain Initiation, Translational | 
              | Peptide Chain Termination, Translational | 
              | Peptide Chloromethyl Ketones use Amino Acid Chloromethyl Ketones | 
              | Peptide Elongation Factor 1 | 
              | Peptide Elongation Factor 2 | 
              | Peptide Elongation Factor G | 
              | Peptide Elongation Factor Tu | 
              | Peptide Elongation Factors | 
              | Peptide Fingerprinting use Peptide Mapping | 
              | Peptide Fragments | 
              | Peptide Histidine-Isoleucine use Peptide PHI | 
              | Peptide Hormone Receptors use Receptors, Peptide | 
              | Peptide Hormones | 
              | Peptide Hydrolase Inhibitors use Protease Inhibitors | 
              | Peptide Hydrolases | 
              | Peptide Initiation Factor EIF-1 use Eukaryotic Initiation Factor-1 | 
              | Peptide Initiation Factor EIF-2 use Eukaryotic Initiation Factor-2 | 
              | Peptide Initiation Factor EIF-2B use Eukaryotic Initiation Factor-2B | 
              | Peptide Initiation Factor EIF-3 use Eukaryotic Initiation Factor-3 | 
              | Peptide Initiation Factor EIF-4A use Eukaryotic Initiation Factor-4A | 
              | Peptide Initiation Factor EIF-4E use Eukaryotic Initiation Factor-4E | 
              | Peptide Initiation Factor EIF-4F use Eukaryotic Initiation Factor-4F | 
              | Peptide Initiation Factor EIF-4G use Eukaryotic Initiation Factor-4G | 
              | Peptide Initiation Factor EIF-5 use Eukaryotic Initiation Factor-5 | 
              | Peptide Initiation Factor IF-1 use Prokaryotic Initiation Factor-1 | 
              | Peptide Initiation Factor IF-2 use Prokaryotic Initiation Factor-2 | 
              | Peptide Initiation Factor IF-3 use Prokaryotic Initiation Factor-3 | 
              | Peptide Initiation Factors | 
              | Peptide Initiation Factors, Eukaryotic use Eukaryotic Initiation Factors | 
              | Peptide Initiation Factors, Prokaryotic use Prokaryotic Initiation Factors | 
              | Peptide Library | 
              | Peptide Mapping | 
              | Peptide Nucleic Acids | 
              | Peptide Peptidohydrolase Inhibitors use Protease Inhibitors | 
              | Peptide Peptidohydrolases use Endopeptidases | 
              | Peptide PHI | 
              | Peptide PHM use Peptide PHI | 
              | Peptide Receptors use Receptors, Peptide | 
              | Peptide Receptors, Invertebrate use Receptors, Invertebrate Peptide | 
              | Peptide Sequence Analysis use Sequence Analysis, Protein | 
              | Peptide Synthases | 
              | Peptide Synthetases use Peptide Synthases | 
              | Peptide T | 
              | Peptide Termination Factors | 
              | Peptide Vaccines use Vaccines, Subunit | 
              | Peptide YY | 
              | Peptide-Methionine (R)-S-oxide Reductase use Methionine Sulfoxide Reductases | 
              | Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase | 
              | Peptides | 
              | Peptides, Cyclic | 
              | Peptidoglycan | 
              | Peptidoglycan Glycosyltransferase | 
              | Peptidomimetics | 
              | Peptidyl Transferases | 
              | Peptidyl Translocases use Peptidyl Transferases | 
              | Peptidyl-Dipeptidase A | 
              | Peptidyl-Prolyl cis-trans Isomerase A use Cyclophilin A | 
              | Peptidyl-Prolyl cis-trans-Isomerase use Peptidylprolyl Isomerase | 
              | Peptidylprolyl Isomerase | 
              | Peptidyltransferase use Peptidyl Transferases | 
              | Peptococcaceae | 
              | Peptococcus | 
              | Peptoids | 
              | Peptones | 
              | Peptostreptococcus | 
              | Per Capita Income | 
              | Peracetic Acid | 
              | Perazine | 
              | Perca use Perches | 
              | Perception | 
              | Perception, Social use Social Perception | 
              | Perceptrons use Neural Networks (Computer) | 
              | Perceptual Closure | 
              | Perceptual Completion Phenomena use Perceptual Closure | 
              | Perceptual Defense | 
              | Perceptual Disorders | 
              | Perceptual Disorders, Auditory use Auditory Perceptual Disorders | 
              | Perceptual Distortion | 
              | Perceptual Masking | 
              | Perceptual Motor Performance use Psychomotor Performance | 
              | Perch use Perches | 
              | Perches | 
              | Perchlorates | 
              | Perchloroethylene use Tetrachloroethylene | 
              | Percidae use Perches | 
              | Perciformes | 
              | Percolating Filters use Biological Filters | 
              | Percolating Liquid | 
              | Percolating Water use Percolating Liquid | 
              | Percolation | 
              | Percussion | 
              | Percussion Drilling | 
              | Percutaneous Administration use Administration, Cutaneous | 
              | Percutaneous Atherectomy use Atherectomy | 
              | Percutaneous Coronary Intervention | 
              | Percutaneous Electric Nerve Stimulation use Transcutaneous Electric Nerve Stimulation | 
              | Percutaneous Nephrolithotomy use Nephrostomy, Percutaneous | 
              | Percutaneous Nephrostomy use Nephrostomy, Percutaneous | 
              | Percutaneous Transluminal Angioplasty use Angioplasty | 
              | Percutaneous Transluminal Coronary Angioplasty use Angioplasty, Balloon, Coronary | 
              | Percutaneous Transluminal Laser Angioplasty use Angioplasty, Balloon, Laser-Assisted | 
              | Percutaneous Ultrasonic Lithotripsy use Lithotripsy | 
              | Perfluorocarbons use Fluorocarbons | 
              | Perforant Pathway | 
              | Perforating Fasciculus use Perforant Pathway | 
              | Perforator Flap | 
              | Perforin | 
              | Performance Anxiety | 
              | Performance Appraisal, Employee use Employee Performance Appraisal | 
              | Performance Evaluation [Equipment] use Performance Tests | 
              | Performance Tests | 
              | Performance-Enhancing Drugs use Performance-Enhancing Substances | 
              | Performance-Enhancing Substances | 
              | Perfume | 
              | Perfumed Towelettes use Wet Wipes | 
              | Perfumed Waters | 
              | Perfusion | 
              | Perfusion Cancer Chemotherapy, Regional use Chemotherapy, Cancer, Regional Perfusion | 
              | Perfusion Imaging | 
              | Perfusion Pumps use Infusion Pumps | 
              | Perfusion Pumps, Implantable use Infusion Pumps, Implantable | 
              | Perfusion, Pulsatile use Pulsatile Flow | 
              | Pergolide | 
              | Perhexiline | 
              | Peri-Implantitis | 
              | Periadenitis Mucosa Necrotica Recurrens use Stomatitis, Aphthous | 
              | Periamygdaloid Cortex | 
              | Perianal Gland Neoplasms use Anal Gland Neoplasms | 
              | Perianal Glands | 
              | Perianeurysmal Fibrosis, Inflammatory use Retroperitoneal Fibrosis | 
              | Periaortitis, Chronic use Retroperitoneal Fibrosis | 
              | Periapical Abscess | 
              | Periapical Cyst use Radicular Cyst | 
              | Periapical Diseases | 
              | Periapical Granuloma | 
              | Periapical Periodontitis | 
              | Periapical Periodontitis, Chronic Nonsuppurative use Periapical Granuloma | 
              | Periapical Periodontitis, Suppurative use Periapical Abscess | 
              | Periapical Tissue | 
              | Periaqueductal Gray | 
              | Periarteritis Nodosa use Polyarteritis Nodosa | 
              | Periarthritis | 
              | Pericardial Cyst use Mediastinal Cyst | 
              | Pericardial Effusion | 
              | Pericardial Tamponade use Cardiac Tamponade | 
              | Pericardial Window Techniques | 
              | Pericardiectomy | 
              | Pericardiocentesis | 
              | Pericardiostomy use Pericardial Window Techniques | 
              | Pericardiotomy use Pericardiectomy | 
              | Pericarditis | 
              | Pericarditis, Constrictive | 
              | Pericarditis, Tuberculous | 
              | Pericardium | 
              | Pericementitis use Periodontitis | 
              | Pericentriolar Region use Centrosome | 
              | Pericoronitis | 
              | Pericytes | 
              | Peridinium use Dinoflagellida | 
              | Peridural Injections use Injections, Epidural | 
              | Perilene use Perylene | 
              | Perilla | 
              | Perilla frutescens | 
              | Perilymph | 
              | Perilymphatic Duct use Cochlear Aqueduct | 
              | Perimeningeal Infections | 
              | Perimenopausal Bone Loss use Osteoporosis, Postmenopausal | 
              | Perimenopause | 
              | Perinatal Care | 
              | Perinatal Death | 
              | Perinatal Mortality | 
              | Perinatal Nursing use Neonatal Nursing | 
              | Perinatal Subarachnoid Hemorrhage use Subarachnoid Hemorrhage | 
              | Perinatology | 
              | Perindopril | 
              | Perinephritis | 
              | Perineum | 
              | Perineurial Cysts use Tarlov Cysts | 
              | Perineurioma use Nerve Sheath Neoplasms | 
              | Perineurium use Peripheral Nerves | 
              | Perineuronal Oligodendroglia use Oligodendroglia | 
              | Perineuronal Satellite Cells use Satellite Cells, Perineuronal | 
              | Perineuronal Satellite Oligodendroglia Cells use Oligodendroglia | 
              | Periocular Dermatitis use Dermatitis, Perioral | 
              | Period Analysis | 
              | Period Circadian Proteins | 
              | Period Effect | 
              | Period, Neurologic Refractory use Refractory Period, Electrophysiological | 
              | Periodic Abstinence use Natural Family Planning Methods | 
              | Periodic Acid | 
              | Periodic Acid-Schiff Reaction | 
              | Periodic Alternating Nystagmus use Nystagmus, Pathologic | 
              | Periodic Disease use Familial Mediterranean Fever | 
              | Periodic Disease, Wolff's use Familial Mediterranean Fever | 
              | Periodic Limb Movement Disorder use Nocturnal Myoclonus Syndrome | 
              | Periodic Movement Disorder, Sleep use Nocturnal Myoclonus Syndrome | 
              | Periodic Paralysis, Familial use Paralyses, Familial Periodic | 
              | Periodical Index | 
              | Periodicals | 
              | Periodicals as Topic | 
              | Periodicals Publishing, Dental use Journalism, Dental | 
              | Periodicity | 
              | Periodicity in Homeopathy use Modalities, Periodical | 
              | Periodontal Abscess | 
              | Periodontal Atrophy | 
              | Periodontal Attachment Loss | 
              | Periodontal Bone Loss use Alveolar Bone Loss | 
              | Periodontal Cyst | 
              | Periodontal Cyst, Apical use Radicular Cyst | 
              | Periodontal Debridement | 
              | Periodontal Diseases | 
              | Periodontal Dressings | 
              | Periodontal Epithelial Debridement use Subgingival Curettage | 
              | Periodontal Guided Tissue Regeneration use Guided Tissue Regeneration, Periodontal | 
              | Periodontal Index | 
              | Periodontal Ligament | 
              | Periodontal Pocket | 
              | Periodontal Prosthesis | 
              | Periodontal Resorption use Alveolar Bone Loss | 
              | Periodontal Splints | 
              | Periodontics | 
              | Periodontitis | 
              | Periodontitis, Acute Nonsuppurative use Periapical Periodontitis | 
              | Periodontitis, Apical use Periapical Periodontitis | 
              | Periodontitis, Apical, Chronic Nonsuppurative use Periapical Granuloma | 
              | Periodontitis, Apical, Suppurative use Periapical Abscess | 
              | Periodontitis, Juvenile use Aggressive Periodontitis | 
              | Periodontitis, Prepubertal use Aggressive Periodontitis | 
              | Periodontium | 
              | Periodontium, Apical use Periapical Tissue | 
              | Periodontosis use Aggressive Periodontitis | 
              | Periods, Neurologic Refractory use Refractory Period, Electrophysiological | 
              | Perioperative Care | 
              | Perioperative Nursing | 
              | Perioperative Period | 
              | Perioral Dermatitis use Dermatitis, Perioral | 
              | Periosteum | 
              | Periostitis | 
              | Periostitis, Alveolar use Dry Socket | 
              | Peripartum Period | 
              | Peripheral Angiopathies use Peripheral Vascular Diseases | 
              | Peripheral Arterial Disease | 
              | Peripheral Autoimmune Demyelinating Disease use Polyradiculoneuropathy | 
              | Peripheral Autonomic Nervous System Diseases use Autonomic Nervous System Diseases | 
              | Peripheral Blood Stem Cell Transplantation | 
              | Peripheral Catheterization use Catheterization, Peripheral | 
              | Peripheral Equipment, Computer use Computer Peripherals | 
              | Peripheral Nerve Diseases use Peripheral Nervous System Diseases | 
              | Peripheral Nerve Injuries | 
              | Peripheral Nerve Injury use Peripheral Nerve Injuries | 
              | Peripheral Nerve Sheath Tumors use Nerve Sheath Neoplasms | 
              | Peripheral Nerves | 
              | Peripheral Nervous System | 
              | Peripheral Nervous System Agents | 
              | Peripheral Nervous System Diseases | 
              | Peripheral Nervous System Lyme Disease use Lyme Neuroborreliosis | 
              | Peripheral Nervous System Neoplasms | 
              | Peripheral Neurofibromatosis use Neurofibromatosis 1 | 
              | Peripheral Neuropathies use Peripheral Nervous System Diseases | 
              | Peripheral Neuropathy, Alcohol-Induced use Alcoholic Neuropathy | 
              | Peripheral Neuropathy, Paraneoplastic use Paraneoplastic Polyneuropathy | 
              | Peripheral Population use Suburban Population | 
              | Peripheral Primitive Neuroectodermal Tumors use Neuroectodermal Tumors, Primitive, Peripheral | 
              | Peripheral Resistance use Vascular Resistance | 
              | Peripheral Stem Cell Transplantation use Peripheral Blood Stem Cell Transplantation | 
              | Peripheral T-Cell Lymphoma use Lymphoma, T-Cell, Peripheral | 
              | Peripheral Tolerance | 
              | Peripheral Vascular Diseases | 
              | Peripherins | 
              | Periphlebitis use Phlebitis | 
              | Periphyton | 
              | Periplaneta | 
              | Periplaneta americana use Periplaneta | 
              | Periplasm | 
              | Periplasmic Binding Proteins | 
              | Periplasmic Proteins | 
              | Periploca | 
              | Periploca graeca | 
              | Periploca indica use Hemidesmus | 
              | Periprosthetic Fractures | 
              | Perishable Foods | 
              | Perissodactyla | 
              | Peristalsis | 
              | Peristaltic Pumps, Implantable use Infusion Pumps, Implantable | 
              | Peritoneal Absorption | 
              | Peritoneal Cavity | 
              | Peritoneal Dialysis | 
              | Peritoneal Dialysis, Continuous Ambulatory | 
              | Peritoneal Diseases | 
              | Peritoneal Effusion use Ascitic Fluid | 
              | Peritoneal Fibrosing Syndrome use Peritoneal Fibrosis | 
              | Peritoneal Fibrosis | 
              | Peritoneal Fluid use Ascitic Fluid | 
              | Peritoneal Infusions use Infusions, Parenteral | 
              | Peritoneal Irrigation use Peritoneal Lavage | 
              | Peritoneal Lavage | 
              | Peritoneal Macrophages use Macrophages, Peritoneal | 
              | Peritoneal Neoplasms | 
              | Peritoneal Sclerosis use Peritoneal Fibrosis | 
              | Peritoneal Stomata | 
              | Peritoneoscopes use Laparoscopes | 
              | Peritoneoscopy use Laparoscopy | 
              | Peritoneovenous Shunt | 
              | Peritoneum | 
              | Peritoneum, Parietal use Peritoneum | 
              | Peritoneum, Visceral use Peritoneum | 
              | Peritonitis | 
              | Peritonitis, Chylous use Chylous Ascites | 
              | Peritonitis, Tuberculous | 
              | Peritonsillar Abscess | 
              | Perivascular Epithelioid Cell Neoplasms | 
              | Perivascular Oligodendroglia use Oligodendroglia | 
              | Periventricular Leukomalacia use Leukomalacia, Periventricular | 
              | Periventricular Nodular Heterotopia | 
              | Periventricular Nuclei of Thalamus use Midline Thalamic Nuclei | 
              | Periwinkle use Vinca | 
              | Periwinkle, Madagascar use Catharanthus | 
              | Permafrost | 
              | Permanent Employees use Workers | 
              | Permanent Vegetative State use Persistent Vegetative State | 
              | Permanent Workers use Workers | 
              | Permeability | 
              | Permeability, Capillary use Capillary Permeability | 
              | Permeability, Cell Membrane use Cell Membrane Permeability | 
              | Permeability, Microvascular use Capillary Permeability | 
              | Permeability, Tooth use Tooth Permeability | 
              | Permeable Soils use Soil Permeability | 
              | Permethrin | 
              | Permissible Limits | 
              | Permissiveness | 
              | Permitted Level use Permissible Limits | 
              | Perna | 
              | Pernicious Vomiting of Pregnancy use Hyperemesis Gravidarum | 
              | Perodicticus potto use Lorisidae | 
              | Peromyscus | 
              | Peroneal Muscular Atrophy use Charcot-Marie-Tooth Disease | 
              | Peroneal Nerve | 
              | Peroneal Neuropathies | 
              | Peronospora | 
              | Peroperative Care use Intraoperative Care | 
              | Peroperative Complications use Intraoperative Complications | 
              | Peroxidase | 
              | Peroxidase-Antiperoxidase Complex Technique use Immunoenzyme Techniques | 
              | Peroxidase-Labeled Antibody Technique use Immunoenzyme Techniques | 
              | Peroxidases | 
              | Peroxides | 
              | Peroxiredoxin use Peroxiredoxins | 
              | Peroxiredoxin III | 
              | Peroxiredoxin VI | 
              | Peroxiredoxins | 
              | Peroxisomal Bifunctional Enzyme | 
              | Peroxisomal Disorders | 
              | Peroxisomal Multifunctional Protein-2 | 
              | Peroxisomal-Bifunctional Enzymes use Peroxisomal Bifunctional Enzyme | 
              | Peroxisome Proliferator-Activated Receptors | 
              | Peroxisome Proliferators | 
              | Peroxisomes | 
              | Peroxyacetic Acid use Peracetic Acid | 
              | Peroxynitrite use Peroxynitrous Acid | 
              | Peroxynitrous Acid | 
              | Perphenazine | 
              | Persea | 
              | Persia | 
              | Persian Cumin use Carum carvi | 
              | Persian Empire use Persia | 
              | Persian Gulf use Indian Ocean | 
              | Persian Gulf Syndrome | 
              | Persian Lilac use Melia azedarach | 
              | Persian Walnut use Juglans regia | 
              | Persimmon use Diospyros | 
              | Persistent Common Atrioventricular Canal use Endocardial Cushion Defects | 
              | Persistent Fetal Circulation Syndrome | 
              | Persistent Hyaloid Artery use Persistent Hyperplastic Primary Vitreous | 
              | Persistent Hyperinsulinemia Hypoglycemia of Infancy use Congenital Hyperinsulinism | 
              | Persistent Hyperplastic Primary Vitreous | 
              | Persistent Ostium Primum use Heart Septal Defects, Atrial | 
              | Persistent Pollutants use Conservative Pollutants | 
              | Persistent Pulmonary Hypertension of Newborn use Persistent Fetal Circulation Syndrome | 
              | Persistent Vegetative State | 
              | Person with Illness use Patients | 
              | Person with Sickness use Patients | 
              | Personal Autonomy | 
              | Personal Construct Theory | 
              | Personal Digital Assistant use Computers, Handheld | 
              | Personal Expenditures use Financing, Personal | 
              | Personal Genetic Information use Genetic Privacy | 
              | Personal Health Services | 
              | Personal Hygiene use Hygiene | 
              | Personal Hygiene Products | 
              | Personal Liability use Liability, Legal | 
              | Personal Narratives | 
              | Personal Narratives as Topic | 
              | Personal Protection | 
              | Personal Satisfaction | 
              | Personal Space | 
              | Personality | 
              | Personality Assessment | 
              | Personality Development | 
              | Personality Disorder, Antisocial use Antisocial Personality Disorder | 
              | Personality Disorder, Borderline use Borderline Personality Disorder | 
              | Personality Disorder, Compulsive use Compulsive Personality Disorder | 
              | Personality Disorder, Dependent use Dependent Personality Disorder | 
              | Personality Disorder, Histrionic use Histrionic Personality Disorder | 
              | Personality Disorder, Paranoid use Paranoid Personality Disorder | 
              | Personality Disorder, Passive-Aggressive use Passive-Aggressive Personality Disorder | 
              | Personality Disorder, Schizoid use Schizoid Personality Disorder | 
              | Personality Disorder, Schizotypal use Schizotypal Personality Disorder | 
              | Personality Disorders | 
              | Personality Inventory | 
              | Personality Tests | 
              | Personality Type A use Type A Personality | 
              | Personality, Hysterical use Histrionic Personality Disorder | 
              | Personhood | 
              | Personnel Administration, Hospital | 
              | Personnel Delegation | 
              | Personnel Discipline use Employee Discipline | 
              | Personnel Downsizing | 
              | Personnel Loyalty | 
              | Personnel Management | 
              | Personnel Management, Hospital use Personnel Administration, Hospital | 
              | Personnel Recruitment use Personnel Selection | 
              | Personnel Selection | 
              | Personnel Staffing and Scheduling | 
              | Personnel Staffing and Scheduling Information Systems | 
              | Personnel Turnover | 
              | Personnel, Hospital | 
              | Personnel, Hospital, Organization and Administration use Personnel Administration, Hospital | 
              | Persons | 
              | Persons with Disabilities use Disabled Persons | 
              | Persons With Hearing Impairments | 
              | Persuasion use Persuasive Communication | 
              | Persuasive Communication | 
              | PERT use Critical Path Method | 
              | Pertechnetate Sodium use Sodium Pertechnetate Tc 99m | 
              | Perthes Disease use Legg-Calve-Perthes Disease | 
              | Pertussigen use Pertussis Toxin | 
              | Pertussinum | 
              | Pertussis use Whooping Cough | 
              | Pertussis Toxin | 
              | Pertussis Vaccine | 
              | Peru | 
              | Peruvian Bark use Cinchona | 
              | Peruvian Mastic use Schinus molle | 
              | Peruvian Peppertree use Schinus molle | 
              | Pervasive Child Development Disorders use Child Development Disorders, Pervasive | 
              | Pervasive Development Disorders use Child Development Disorders, Pervasive | 
              | Perylene | 
              | Pes Cavus use Foot Deformities | 
              | Pes Planus use Flatfoot | 
              | Pessaries | 
              | Pest Control | 
              | Pest Control, Biological | 
              | Pest Management use Pest Control | 
              | Peste-des-Petits-Ruminants | 
              | Peste-des-petits-ruminants virus | 
              | Pesticide Exposure | 
              | Pesticide Industry | 
              | Pesticide Residues | 
              | Pesticide Synergists | 
              | Pesticide Utilization | 
              | Pesticides | 
              | Pesticides Industry use Pesticide Industry | 
              | Pestinum | 
              | Pestivirus | 
              | Pestivirus Infections | 
              | Pet Facilitated Therapy use Animal Assisted Therapy | 
              | PET Scan use Positron-Emission Tomography | 
              | Pet Therapy use Animal Assisted Therapy | 
              | Pet-Human Bonding use Bonding, Human-Pet | 
              | Petasites | 
              | Petasites fragrans use Tussilago fragans | 
              | Petasites officinalis use Tussilago petasites | 
              | Petechiae use Purpura | 
              | Pethidine use Meperidine | 
              | Petit Mal Epilepsy use Epilepsy, Absence | 
              | Petit Mal Status use Status Epilepticus | 
              | Petiveria alliacea use Petiveria tetrandra | 
              | Petiveria tetrandra | 
              | Petriellidium use Pseudallescheria | 
              | Petrogale use Macropodidae | 
              | Petrolatum | 
              | Petrolatum, Liquid use Mineral Oil | 
              | Petroleum | 
              | Petroleum (Homeopathy) | 
              | Petroleum Derivates use Petroleum Industry | 
              | Petroleum Industry | 
              | Petroleum Jelly use Petrolatum | 
              | Petroleum Pollution | 
              | Petroleum Refineries use Petroleum Industry | 
              | Petromyzon | 
              | Petromyzon marinus use Petromyzon | 
              | Petromyzontidae use Lampreys | 
              | Petrosal Sinus Sampling | 
              | Petroselinum | 
              | Petroselinum sativum | 
              | Petrosia | 
              | Petrositis | 
              | Petrous Bone | 
              | Petrous Pyramid use Petrous Bone | 
              | Petrous Sinus Thrombosis use Sinus Thrombosis, Intracranial | 
              | Pets | 
              | Petty Morel use Aralia racemosa | 
              | Petty Spurge use Euphorbia peplus | 
              | Petunia | 
              | Petuvirus use Caulimoviridae | 
              | Peucedanum oreoselinum use Athamanta oreoselinum | 
              | Peucedanum ostruthium use Imperatoria ostruthium | 
              | Peumus | 
              | Peumus boldus use Boldo (Homeopathy) | 
              | Peutz-Jeghers Syndrome | 
              | Peyer's Patches | 
              | Peyote use Mescaline | 
              | Peyote (Homeopatia) use Anhalonium lewinii | 
              | Peyotl (Homeopathy) use Anhalonium lewinii | 
              | Peyronie's Disease use Penile Induration | 
              | PF 3 use Platelet Factor 3 | 
              | Pf1 Phage use Bacteriophage Pf1 | 
              | Pfaundler-Hurler Syndrome use Mucopolysaccharidosis I | 
              | Pfeiffer Syndrome use Acrocephalosyndactylia | 
              | Pfiesteria piscicida | 
              | PG Analogs use Prostaglandins, Synthetic | 
              | PGA use Prostaglandins A | 
              | PGA Synthetic use Prostaglandins A, Synthetic | 
              | PGB use Prostaglandins B | 
              | PGD use Prostaglandins D | 
              | PGD2 use Prostaglandin D2 | 
              | PGE use Prostaglandins E | 
              | PGE Receptors use Receptors, Prostaglandin E | 
              | PGE Synthetic use Prostaglandins E, Synthetic | 
              | PGE1 use Alprostadil | 
              | PGE2 use Dinoprostone | 
              | PGE2 Receptors use Receptors, Prostaglandin E | 
              | PGE2alpha use Dinoprostone | 
              | PGF use Prostaglandins F | 
              | PGF Synthetic use Prostaglandins F, Synthetic | 
              | PGF2 use Dinoprost | 
              | PGF2alpha use Dinoprost | 
              | PGG use Prostaglandins G | 
              | PGH Synthase use Prostaglandin-Endoperoxide Synthases | 
              | PGH2 use Prostaglandin H2 | 
              | PGI2 use Epoprostenol | 
              | PGI2 Receptor use Receptors, Epoprostenol | 
              | PGX use Epoprostenol | 
              | pH use Hydrogen-Ion Concentration | 
              | pH Diminution use Acidification | 
              | pH gradient use Proton-Motive Force | 
              | pH Increase use Alkalinization | 
              | pH Reduction use Acidification | 
              | Ph1 Chromosome use Philadelphia Chromosome | 
              | Phacochoerus use Swine | 
              | Phacoemulsification | 
              | Phacomatosis use Neurocutaneous Syndromes | 
              | Phaeohyphomycosis | 
              | Phaeophyceae use Phaeophyta | 
              | Phaeophyta | 
              | Phage Attachment Sites use Attachment Sites, Microbiological | 
              | Phage Display Peptide Library use Peptide Library | 
              | Phage fd use Bacteriophage M13 | 
              | Phage G4 use Microvirus | 
              | Phage IKe use Bacteriophage IKe | 
              | Phage lambda use Bacteriophage lambda | 
              | Phage M13 use Bacteriophage M13 | 
              | Phage MS2 use Levivirus | 
              | Phage mu use Bacteriophage mu | 
              | Phage mu 2 use Leviviridae | 
              | Phage N4 use Bacteriophage N4 | 
              | Phage P1 use Bacteriophage P1 | 
              | Phage P2 use Bacteriophage P2 | 
              | Phage P22 use Bacteriophage P22 | 
              | Phage Pf1 use Bacteriophage Pf1 | 
              | Phage phi 105 use Bacillus Phages | 
              | Phage phi 29 use Bacillus Phages | 
              | Phage phi 6 use Bacteriophage phi 6 | 
              | Phage phi X 174 use Bacteriophage phi X 174 | 
              | Phage PRD1 use Bacteriophage PRD1 | 
              | Phage Q beta use Allolevivirus | 
              | Phage Receptors use Receptors, Virus | 
              | Phage T2 use Bacteriophage T4 | 
              | Phage T3 use Bacteriophage T3 | 
              | Phage T4 use Bacteriophage T4 | 
              | Phage T7 use Bacteriophage T7 | 
              | Phage Typing use Bacteriophage Typing | 
              | Phages use Bacteriophages | 
              | Phages T use T-Phages | 
              | Phages, lambda-Like use Siphoviridae | 
              | Phages, RNA use RNA Phages | 
              | Phages, T5-like use Siphoviridae | 
              | Phages, T7-like use Podoviridae | 
              | Phagnalon use Asteraceae | 
              | Phagocyte Bactericidal Dysfunction | 
              | Phagocytes | 
              | Phagocytosis | 
              | Phagolysosomes use Phagosomes | 
              | Phagosomes | 
              | Phakic Intraocular Lenses | 
              | Phakomatoses use Neurocutaneous Syndromes | 
              | Phakomatosis, Bourneville use Tuberous Sclerosis | 
              | Phakomatosis, Sturge-Weber use Sturge-Weber Syndrome | 
              | Phalaenopsis use Orchidaceae | 
              | Phalanger use Phalangeridae | 
              | Phalangeridae | 
              | Phalanges of Fingers use Finger Phalanges | 
              | Phalanges of Toes use Toe Phalanges | 
              | Phalaris | 
              | Phalaris zizanioides use Anatherum muricatum | 
              | Phallic Stage use Psychosexual Development | 
              | Phalloidine | 
              | Phallus impudicus | 
              | Phaner use Cheirogaleidae | 
              | Phanerochaete | 
              | Phantom Limb | 
              | Phantoms, Imaging | 
              | Phantoms, Radiographic use Phantoms, Imaging | 
              | Phantoms, Radiologic use Phantoms, Imaging | 
              | Pharmaceutic Aids | 
              | Pharmaceutic Aids (Preservatives) use Preservatives, Pharmaceutical | 
              | Pharmaceutical Care | 
              | Pharmaceutical Centers | 
              | Pharmaceutical Centres use Pharmaceutical Centers | 
              | Pharmaceutical Commerce use Pharmaceutical Trade | 
              | Pharmaceutical Commercialization use Pharmaceutical Trade | 
              | Pharmaceutical Drug Commerce use Pharmaceutical Trade | 
              | Pharmaceutical Drug Commercialization use Pharmaceutical Trade | 
              | Pharmaceutical Drug Trade use Pharmaceutical Trade | 
              | Pharmaceutical Economics use Economics, Pharmaceutical | 
              | Pharmaceutical Equivalents use Bioequivalent Drugs | 
              | Pharmaceutical Management use Pharmacy Administration | 
              | Pharmaceutical Policy use Drug and Narcotic Control | 
              | Pharmaceutical Preparations | 
              | Pharmaceutical Preparations (Homeopathy) use Homeopathic Vehicles | 
              | Pharmaceutical Preparations, Dental | 
              | Pharmaceutical Presentation (Homeopathy) use Homeopathic Vehicles | 
              | Pharmaceutical Presentation Form (Homeopathy) use Homeopathic Vehicles | 
              | Pharmaceutical Raw Material | 
              | Pharmaceutical Services | 
              | Pharmaceutical Services, Online | 
              | Pharmaceutical Solutions | 
              | Pharmaceutical Trade | 
              | Pharmaceutical Vehicles | 
              | Pharmaceuticals Derived from Blood use Blood-Derivative Drugs | 
              | Pharmacies | 
              | Pharmacists | 
              | Pharmacists' Aides | 
              | Pharmacodynamic Action of Homeopathic Drugs use Pharmacodynamic Action of Homeopathic Remedy | 
              | Pharmacodynamic Action of Homeopathic Remedy | 
              | Pharmacodynamics in Homeopathy use Pharmacodynamic Action of Homeopathic Remedy | 
              | Pharmacoeconomics use Economics, Pharmaceutical | 
              | Pharmacoepidemiology | 
              | Pharmacogenetics | 
              | Pharmacogenomics use Pharmacogenetics | 
              | Pharmacognosy | 
              | Pharmacokinetics | 
              | Pharmacologic Actions | 
              | Pharmacologic Processes use Pharmacological Processes | 
              | Pharmacological Mechanisms of Action use Molecular Mechanisms of Pharmacological Action | 
              | Pharmacological Phenomena | 
              | Pharmacological Processes | 
              | Pharmacology | 
              | Pharmacology, Clinical | 
              | Pharmacopeias, Homeopathic use Pharmacopoeias, Homeopathic | 
              | Pharmacopoeias | 
              | Pharmacopoeias as Topic | 
              | Pharmacopoeias, Homeopathic | 
              | Pharmacotherapy use Drug Therapy | 
              | Pharmacovigilance | 
              | Pharmacy | 
              | Pharmacy Administration | 
              | Pharmacy and Therapeutics Committee | 
              | Pharmacy Education use Education, Pharmacy | 
              | Pharmacy Education, Continuing use Education, Pharmacy, Continuing | 
              | Pharmacy Education, Graduate use Education, Pharmacy, Graduate | 
              | Pharmacy Residencies | 
              | Pharmacy Schools use Schools, Pharmacy | 
              | Pharmacy Service, Clinical use Pharmacy Service, Hospital | 
              | Pharmacy Service, Hospital | 
              | Pharyngeal Arches use Branchial Region | 
              | Pharyngeal Cancer use Pharyngeal Neoplasms | 
              | Pharyngeal Diseases | 
              | Pharyngeal Diverticulum use Zenker Diverticulum | 
              | Pharyngeal Muscles | 
              | Pharyngeal Neoplasms | 
              | Pharyngeal Tonsils use Adenoids | 
              | Pharyngectomy | 
              | Pharyngitis | 
              | Pharyngo-Conjunctival Fever use Adenovirus Infections, Human | 
              | Pharyngoesophageal Diverticulum use Zenker Diverticulum | 
              | Pharyngostomy | 
              | Pharynx | 
              | Phascolarctidae | 
              | Phascolarctos cinereus use Phascolarctidae | 
              | Phase Desynchronization, EEG use Electroencephalography Phase Synchronization | 
              | Phase I Clinical Trials use Clinical Trials, Phase I as Topic | 
              | Phase Synchronization, EEG use Electroencephalography Phase Synchronization | 
              | Phase Transition | 
              | Phase-Contrast Microscopy use Microscopy, Phase-Contrast | 
              | Phaseolus | 
              | Phaseolus nanus | 
              | Phaseolus vulgaris use Phaseolus nanus | 
              | Phaseolus vulgaris Lectins use Phytohemagglutinins | 
              | Phases of Toxicity | 
              | Phasmidia use Secernentea | 
              | Phasmidia Infections use Secernentea Infections | 
              | Pheasant's Eye (Adonis vernalis) use Adonis | 
              | Phellandrium aquaticum | 
              | Phellodendron | 
              | Phelypressin use Felypressin | 
              | PHEMA use Polyhydroxyethyl Methacrylate | 
              | Phenacetin | 
              | Phenacetin O-Dealkylase use Cytochrome P-450 CYP1A2 | 
              | Phenacetinum | 
              | Phenalenes | 
              | Phenanthrenes | 
              | Phenanthridines | 
              | Phenanthrolines | 
              | Phenazine Methosulfate use Methylphenazonium Methosulfate | 
              | Phenazines | 
              | Phenazocine | 
              | Phenazoline use Antazoline | 
              | Phenazone use Antipyrine | 
              | Phenazopyridine | 
              | Phenbenzorphan use Phenazocine | 
              | Phencyclidine | 
              | Phencyclidine Abuse | 
              | Phencyclidine Receptors use Receptors, Phencyclidine | 
              | Phencyclidine-Related Disorders use Phencyclidine Abuse | 
              | Phenelzine | 
              | Phenemal use Phenobarbital | 
              | Phenethanolamine N-Methyltransferase use Phenylethanolamine N-Methyltransferase | 
              | Phenethyl Alcohol use Phenylethyl Alcohol | 
              | Phenethylamines | 
              | Phenethylazocine use Phenazocine | 
              | Phenetidine | 
              | Phenformin | 
              | Phenindione | 
              | Pheniramine | 
              | Phenmetraline use Phenmetrazine | 
              | Phenmetrazine | 
              | Phenobarbital | 
              | Phenobarbitalum | 
              | Phenobarbitone use Phenobarbital | 
              | Phenol | 
              | Phenol Acids use Phenolic Compounds | 
              | Phenol Red use Phenolsulfonphthalein | 
              | Phenol Sulfotransferase use Arylsulfotransferase | 
              | Phenolic Compounds | 
              | Phenolic Content use Phenolic Compounds | 
              | Phenolisatin use Oxyphenisatin Acetate | 
              | Phenoloxidase use Monophenol Monooxygenase | 
              | Phenolphthalein | 
              | Phenolphthaleins | 
              | Phenols | 
              | Phenolsulfonphthalein | 
              | Phenolum use Carbolicum Acidum | 
              | Phenomenography use Learning | 
              | Phenoperidine | 
              | Phenopromin use Amphetamine | 
              | Phenothiazines | 
              | Phenotype | 
              | Phenoxazole use Pemoline | 
              | Phenoxyacetates | 
              | Phenoxybenzamine | 
              | Phenoxypropanolamines | 
              | Phenprocoumalol use Phenprocoumon | 
              | Phenprocoumarol use Phenprocoumon | 
              | Phenprocoumon | 
              | Phentanyl use Fentanyl | 
              | Phentermine | 
              | Phentolamine | 
              | Phenyl Ethers | 
              | Phenyl Mercury Compounds use Phenylmercury Compounds | 
              | Phenylacetates | 
              | Phenylalanine | 
              | Phenylalanine Ammonia-Lyase | 
              | Phenylalanine Hydroxylase | 
              | Phenylalanine Hydroxylase Deficiency Disease use Phenylketonurias | 
              | Phenylalanine Lysine Vasopressin use Felypressin | 
              | Phenylalanine Mustard use Melphalan | 
              | Phenylalanine-Specific tRNA use RNA, Transfer, Phe | 
              | Phenylalanine-tRNA Ligase | 
              | Phenylalanyl T RNA Synthetase use Phenylalanine-tRNA Ligase | 
              | Phenylamines use Aniline Compounds | 
              | Phenylammonium Compounds | 
              | Phenylbarbital use Phenobarbital | 
              | Phenylbutazone | 
              | Phenylbutyrates | 
              | Phenylcarbamates | 
              | Phenylcarbamides use Phenylurea Compounds | 
              | Phenylcarbinols use Benzyl Alcohols | 
              | Phenylenediamines | 
              | Phenylephrine | 
              | Phenylethanol use Phenylethyl Alcohol | 
              | Phenylethanolamine N-Methyltransferase | 
              | Phenylethyl Alcohol | 
              | Phenylethylamines use Phenethylamines | 
              | Phenylethylmalonamide | 
              | Phenylethylmalondiamide use Phenylethylmalonamide | 
              | Phenylglyoxal | 
              | Phenylhydrazines | 
              | Phenylisohydantoin use Pemoline | 
              | Phenylisopropyladenosine | 
              | Phenylketonuria, Maternal | 
              | Phenylketonurias | 
              | Phenylmercurials use Phenylmercury Compounds | 
              | Phenylmercuric Acetate | 
              | Phenylmercury Compounds | 
              | Phenylmethanols use Benzyl Alcohols | 
              | Phenylmethylamine use Benzylamines | 
              | Phenylmethylsulfonyl Fluoride | 
              | Phenylphosphonothioic Acid, 2-Ethyl 2-(4-Nitrophenyl) Ester | 
              | Phenylprenazone use Feprazone | 
              | Phenylpropanolamine | 
              | Phenylpropionates | 
              | Phenylpropylhydroxycumarinum use Phenprocoumon | 
              | Phenylpyruvic Acids | 
              | Phenylsulfapyrazole use Sulfaphenazole | 
              | Phenylthiazolylthiourea | 
              | Phenylthiocarbamide use Phenylthiourea | 
              | Phenylthiohydantoin | 
              | Phenylthiourea | 
              | Phenylurea Compounds | 
              | Phenytoin | 
              | Pheochromocytoma | 
              | Pheochromocytoma Cell Line use PC12 Cells | 
              | Pheochromocytoma, Extra-Adrenal use Pheochromocytoma | 
              | Pheophytins | 
              | Pheresis use Blood Component Removal | 
              | Pheromones | 
              | Pheromones, Human | 
              | Pheromones, Sexual use Sex Attractants | 
              | PHEX Phosphate Regulating Neutral Endopeptidase | 
              | phi 6 Phage use Bacteriophage phi 6 | 
              | PHI Peptide use Peptide PHI | 
              | phi X 174 Phage use Bacteriophage phi X 174 | 
              | Phialophora | 
              | Phialophora gougerotii use Exophiala | 
              | Phialophora jeanselmei use Exophiala | 
              | Philadelphia | 
              | Philadelphia Chromosome | 
              | Philadelphus use Philadelphus coronarius | 
              | Philadelphus coronarius | 
              | Philanthropic Funds use Fund Raising | 
              | Philately | 
              | Philippines | 
              | Philodendron | 
              | Philology | 
              | Philology, Classical | 
              | Philology, Oriental | 
              | Philology, Romance | 
              | Philosophy | 
              | Philosophy, Dental | 
              | Philosophy, Medical | 
              | Philosophy, Nursing | 
              | Philtrum use Lip | 
              | Phimosis | 
              | Phlebitis | 
              | Phlebography | 
              | Phlebothrombosis use Venous Thrombosis | 
              | Phlebotominae use Psychodidae | 
              | Phlebotomus | 
              | Phlebotomus Fever | 
              | Phlebotomy | 
              | Phlebovirus | 
              | Phlegmasia Alba Dolens use Thrombophlebitis | 
              | Phlegmon use Cellulitis | 
              | Phleomycins | 
              | Phleum | 
              | Phleum pratense | 
              | Phloem | 
              | Phlomis | 
              | Phloretin | 
              | Phloretin-Glucosidase use Lactase-Phlorizin Hydrolase | 
              | Phlorhizin | 
              | Phlorizin Hydrolase use Lactase-Phlorizin Hydrolase | 
              | Phlorizinum | 
              | Phloroglucinol | 
              | Phloxine B use Eosine I Bluish | 
              | Phobia, School use Phobic Disorders | 
              | Phobia, Social use Phobic Disorders | 
              | Phobias use Phobic Disorders | 
              | Phobic Disorders | 
              | Phobic Neuroses use Phobic Disorders | 
              | Phobos use Mars | 
              | Phoca | 
              | Phocine distemper virus use Distemper Virus, Phocine | 
              | Phocoena | 
              | Phocoenidae use Porpoises | 
              | Phocomelia use Ectromelia | 
              | Phodopus | 
              | Phodopus campbelli use Phodopus | 
              | Phodopus sungorus use Phodopus | 
              | Phodopus sungorus campbelli use Phodopus | 
              | Phoebe use Saturn | 
              | Phoeniceae | 
              | Phoenix dactylifera use Phoeniceae | 
              | Pholiota | 
              | Phomin use Cytochalasin B | 
              | Phonation | 
              | Phonation Disorders use Dysphonia | 
              | Phonetics | 
              | Phonocardiography | 
              | Phonological Impairments use Articulation Disorders | 
              | Phonons | 
              | Phonophoresis | 
              | Phoradendron | 
              | Phorate | 
              | Phorbol 12,13-Dibutyrate | 
              | Phorbol Esters | 
              | Phorbol Myristate Acetate use Tetradecanoylphorbol Acetate | 
              | Phorbols | 
              | Phorias use Strabismus | 
              | Phormium use Agavaceae | 
              | Phosgene | 
              | Phosmet | 
              | Phosphamide use Dimethoate | 
              | Phosphamidon | 
              | Phosphatases use Phosphoric Monoester Hydrolases | 
              | Phosphate Acetyltransferase | 
              | Phosphate Fluoride, Acidulated use Acidulated Phosphate Fluoride | 
              | Phosphate Transport Proteins | 
              | Phosphate-Binding Proteins | 
              | Phosphates | 
              | Phosphates, Inorganic use Phosphates | 
              | Phosphates, Organic use Organophosphates | 
              | Phosphatidal Compounds use Plasmalogens | 
              | Phosphatidate Phosphatase | 
              | Phosphatidate Phosphohydrolase use Phosphatidate Phosphatase | 
              | Phosphatides use Phospholipids | 
              | Phosphatidic Acids | 
              | Phosphatidyl-N-Methylethanolamine N-Methyltransferase | 
              | Phosphatidylcholine-Sterol O-Acyltransferase | 
              | Phosphatidylcholines | 
              | Phosphatidylethanolamine Binding Protein | 
              | Phosphatidylethanolamine N-Methyltransferase | 
              | Phosphatidylethanolamines | 
              | Phosphatidylglycerols | 
              | Phosphatidylinositol 3-Kinase | 
              | Phosphatidylinositol 3-Kinase, Class I use Class I Phosphatidylinositol 3-Kinases | 
              | Phosphatidylinositol 3-Kinase, Class III use Class III Phosphatidylinositol 3-Kinases | 
              | Phosphatidylinositol 3-Kinases | 
              | Phosphatidylinositol 4,5-Diphosphate | 
              | Phosphatidylinositol 4-Kinase use 1-Phosphatidylinositol 4-Kinase | 
              | Phosphatidylinositol Diacylglycerol-Lyase | 
              | Phosphatidylinositol Glycan use Glycosylphosphatidylinositols | 
              | Phosphatidylinositol Phosphates | 
              | Phosphatidylinositol Transfer Proteins use Phospholipid Transfer Proteins | 
              | Phosphatidylinositol-3-OH Kinase use Phosphatidylinositol 3-Kinases | 
              | Phosphatidylinositol-4-Phosphate 3-Kinase | 
              | Phosphatidylinositols | 
              | Phosphatidylserine Synthase use CDPdiacylglycerol-Serine O-Phosphatidyltransferase | 
              | Phosphatidylserines | 
              | Phosphenes | 
              | Phosphines | 
              | Phosphinic Acids | 
              | Phosphinous Acids use Phosphorus Acids | 
              | Phosphites | 
              | Phospho-2-Keto-3-Deoxyheptonate Aldolase use 3-Deoxy-7-Phosphoheptulonate Synthase | 
              | Phospho-Specific Antibodies use Antibodies, Phospho-Specific | 
              | Phosphoacylase use Phosphate Acetyltransferase | 
              | Phosphoadenosine Phosphosulfate | 
              | Phosphoamino Acids | 
              | Phosphocreatine | 
              | Phosphodiesterase 3 Inhibitors | 
              | Phosphodiesterase 4 Inhibitors | 
              | Phosphodiesterase 5 Inhibitors | 
              | Phosphodiesterase Antagonists use Phosphodiesterase Inhibitors | 
              | Phosphodiesterase I | 
              | Phosphodiesterase Inhibitors | 
              | Phosphodiesterases use Phosphoric Diester Hydrolases | 
              | Phosphoenolpyruvate | 
              | Phosphoenolpyruvate Carboxykinase (ATP) | 
              | Phosphoenolpyruvate Carboxykinase (GTP) | 
              | Phosphoenolpyruvate Carboxylase | 
              | Phosphoenolpyruvate Hexose Phosphotransferases use Phosphoenolpyruvate Sugar Phosphotransferase System | 
              | Phosphoenolpyruvate Sugar Phosphotransferase System | 
              | Phosphofructokinase-1 | 
              | Phosphofructokinase-1, Liver Type | 
              | Phosphofructokinase-1, Muscle Type | 
              | Phosphofructokinase-1, Type C | 
              | Phosphofructokinase-2 | 
              | Phosphofructokinases | 
              | Phosphogalactose Uridyl Transferase use UDPglucose-Hexose-1-Phosphate Uridylyltransferase | 
              | Phosphoglucomutase | 
              | Phosphogluconate Dehydrogenase | 
              | Phosphoglucose Isomerase use Glucose-6-Phosphate Isomerase | 
              | Phosphoglyceraldehyde Dehydrogenase use Glyceraldehyde-3-Phosphate Dehydrogenases | 
              | Phosphoglycerate Dehydrogenase | 
              | Phosphoglycerate Kinase | 
              | Phosphoglycerate Mutase | 
              | Phosphoglycerides use Glycerophospholipids | 
              | Phosphoglyceromutase use Phosphoglycerate Mutase | 
              | Phosphohexose Isomerase use Glucose-6-Phosphate Isomerase | 
              | Phosphohydrolases use Phosphoric Monoester Hydrolases | 
              | Phosphoinositide Phospholipase C | 
              | Phosphoinositides use Phosphatidylinositols | 
              | Phospholipase A2 Inhibitors | 
              | Phospholipase A2 Receptor use Receptors, Phospholipase A2 | 
              | Phospholipase B use Lysophospholipase | 
              | Phospholipase C use Type C Phospholipases | 
              | Phospholipase C beta | 
              | Phospholipase C delta | 
              | Phospholipase C gamma | 
              | Phospholipase D | 
              | Phospholipases | 
              | Phospholipases A | 
              | Phospholipases A1 | 
              | Phospholipases A2 | 
              | Phospholipases A2, Calcium-Independent | 
              | Phospholipases A2, Cytosolic | 
              | Phospholipases A2, Group I use Group I Phospholipases A2 | 
              | Phospholipases A2, Group IA use Group IA Phospholipases A2 | 
              | Phospholipases A2, Group IB use Group IB Phospholipases A2 | 
              | Phospholipases A2, Group II use Group II Phospholipases A2 | 
              | Phospholipases A2, Group III use Group III Phospholipases A2 | 
              | Phospholipases A2, Group IV use Group IV Phospholipases A2 | 
              | Phospholipases A2, Group V use Group V Phospholipases A2 | 
              | Phospholipases A2, Group VI use Group VI Phospholipases A2 | 
              | Phospholipases A2, Group X use Group X Phospholipases A2 | 
              | Phospholipases A2, Secretory | 
              | Phospholipases, Type C use Type C Phospholipases | 
              | Phospholipid Ethers | 
              | Phospholipid Transfer Proteins | 
              | Phospholipids | 
              | Phosphomannose Isomerase use Mannose-6-Phosphate Isomerase | 
              | Phosphomonoesterases use Phosphoric Monoester Hydrolases | 
              | Phosphomutases use Phosphotransferases (Phosphomutases) | 
              | Phosphonoacetate use Phosphonoacetic Acid | 
              | Phosphonoacetic Acid | 
              | Phosphonoformate use Foscarnet | 
              | Phosphonoformic Acid use Foscarnet | 
              | Phosphonomycin use Fosfomycin | 
              | Phosphonous Acids use Phosphorus Acids | 
              | Phosphopeptide-Specific Antibodies use Antibodies, Phospho-Specific | 
              | Phosphopeptides | 
              | Phosphoprotein Phosphatase use Phosphoprotein Phosphatases | 
              | Phosphoprotein Phosphatases | 
              | Phosphoprotein Phosphohydrolase use Phosphoprotein Phosphatases | 
              | Phosphoproteins | 
              | Phosphopyruvate Dikinase use Pyruvate, Orthophosphate Dikinase | 
              | Phosphopyruvate Hydratase | 
              | Phosphoramide Mustards | 
              | Phosphoramides | 
              | Phosphoranes | 
              | Phosphorated Pesticides use Insecticides, Organophosphate | 
              | Phosphoribosyl Pyrophosphate | 
              | Phosphoribosyl Pyrophosphate Amidotransferase use Amidophosphoribosyltransferase | 
              | Phosphoribosyl Pyrophosphate Synthetase use Ribose-Phosphate Pyrophosphokinase | 
              | Phosphoribosyl-ATP Pyrophosphorylase use ATP Phosphoribosyltransferase | 
              | Phosphoribosylaminoimidazolecarboxamide Formyltransferase | 
              | Phosphoribosylanthranilate Pyrophosphorylase use Anthranilate Phosphoribosyltransferase | 
              | Phosphoribosylglycinamide Formyltransferase | 
              | Phosphoric Acid Esters use Organophosphates | 
              | Phosphoric Acids | 
              | Phosphoric Diester Hydrolase Inhibitors use Phosphodiesterase Inhibitors | 
              | Phosphoric Diester Hydrolases | 
              | Phosphoric Monoester Hydrolases | 
              | Phosphoric Triester Hydrolases | 
              | Phosphoricum Acidum | 
              | Phosphorothioate Oligonucleotides | 
              | Phosphorous Acids | 
              | Phosphorus | 
              | Phosphorus (Homeopathy) | 
              | Phosphorus Acids | 
              | Phosphorus Albus use Phosphorus (Homeopathy) | 
              | Phosphorus Compounds | 
              | Phosphorus Cycle | 
              | Phosphorus Hydrogenatus | 
              | Phosphorus Isotopes | 
              | Phosphorus Metabolism Disorders | 
              | Phosphorus Muriaticus use Phosphorus Pentachloratus | 
              | Phosphorus Pentachloratus | 
              | Phosphorus Radioisotopes | 
              | Phosphorus, Dietary | 
              | Phosphorus-Oxygen Lyases | 
              | Phosphorylase a | 
              | Phosphorylase b | 
              | Phosphorylase Kinase | 
              | Phosphorylase Phosphatase | 
              | Phosphorylases | 
              | Phosphorylation | 
              | Phosphorylation State-Specific Antibodies use Antibodies, Phospho-Specific | 
              | Phosphorylcholine | 
              | Phosphorylcholine Chloride use Phosphorylcholine | 
              | Phosphorylcholine, Acetyl Glyceryl Ether use Platelet Activating Factor | 
              | Phosphorylcholine-Glyceride Transferase use Diacylglycerol Cholinephosphotransferase | 
              | Phosphoserine | 
              | Phosphothreonine | 
              | Phosphotransacetylase use Phosphate Acetyltransferase | 
              | Phosphotransferases | 
              | Phosphotransferases (Alcohol Group Acceptor) | 
              | Phosphotransferases (Carboxyl Group Acceptor) | 
              | Phosphotransferases (Nitrogenous Group Acceptor) | 
              | Phosphotransferases (Other Substituted Phosphate Groups) use Transferases (Other Substituted Phosphate Groups) | 
              | Phosphotransferases (Paired Acceptors) | 
              | Phosphotransferases (Phosphate Group Acceptor) | 
              | Phosphotransferases (Phosphomutases) | 
              | Phosphotransferases, ATP use Phosphotransferases | 
              | Phosphotriose Isomerase use Triose-Phosphate Isomerase | 
              | Phosphotungstic Acid | 
              | Phosphotyrosine | 
              | Phosphotyrosine Phosphatase use Protein Tyrosine Phosphatases | 
              | Phosvitin | 
              | Photic Stimulation | 
              | Photinia | 
              | Photo-Oxidation use Photooxidation | 
              | Photoacoustic Techniques | 
              | Photoaffinity Labels | 
              | Photoaging of Skin use Skin Aging | 
              | Photoallergy use Dermatitis, Photoallergic | 
              | Photobacterium | 
              | Photobiology | 
              | Photobioreactors | 
              | Photobleaching | 
              | Photochemical Fog use Photochemical Smog | 
              | Photochemical Processes | 
              | Photochemical Smog | 
              | Photochemistry | 
              | Photochemotherapy | 
              | Photochemotherapy, Extracorporeal use Photopheresis | 
              | Photochemotherapy, Hematoporphyrin use Hematoporphyrin Photoradiation | 
              | Photocoagulation use Light Coagulation | 
              | Photocopying use Copying Processes | 
              | Photodensitometry, X-Ray use Absorptiometry, Photon | 
              | Photodermatitis use Photosensitivity Disorders | 
              | Photodynamic Therapy use Photochemotherapy | 
              | Photoelectron Spectrometry use Photoelectron Spectroscopy | 
              | Photoelectron Spectroscopy | 
              | Photofluorography | 
              | Photogrammetry | 
              | Photographic Industry | 
              | Photographs | 
              | Photography | 
              | Photography, Dental | 
              | Photography, Intraoral use Photography, Dental | 
              | Photoinitiators, Dental | 
              | Photokeratectomy use Corneal Surgery, Laser | 
              | Photokymography use Electrokymography | 
              | Photolysis | 
              | Photometry | 
              | Photomicrography | 
              | Photon Absorptiometry use Absorptiometry, Photon | 
              | Photons | 
              | Photooxidation | 
              | Photoperiod | 
              | Photopheresis | 
              | Photophobia | 
              | Photophosphorylation | 
              | Photopic Vision use Color Vision | 
              | Photoplethysmography | 
              | Photoproteins use Luminescent Proteins | 
              | Photoradiation use Light | 
              | Photoradiation Therapy use Phototherapy | 
              | Photoradiation, Hematoporphyrin use Hematoporphyrin Photoradiation | 
              | Photoreactivating Enzyme use Deoxyribodipyrimidine Photo-Lyase | 
              | Photoreceptor Cells | 
              | Photoreceptor Cells, Invertebrate | 
              | Photoreceptor Cells, Vertebrate | 
              | Photoreceptor Connecting Cilium | 
              | Photoreceptors, Invertebrate use Photoreceptor Cells, Invertebrate | 
              | Photoreceptors, Microbial | 
              | Photoreceptors, Plant | 
              | Photoreceptors, Rod use Retinal Rod Photoreceptor Cells | 
              | Photorefractive Keratectomy | 
              | Photorhabdus | 
              | Photorhabdus luminescens use Photorhabdus | 
              | Photosensitivity Disorders | 
              | Photosensitizers use Photosensitizing Agents | 
              | Photosensitizing Agents | 
              | Photosmog use Photochemical Smog | 
              | Photosynthesis | 
              | Photosynthesis Lagoons use Aerobic Lagoons | 
              | Photosynthetic Reaction Center Complex Proteins | 
              | Photosystem I Protein Complex | 
              | Photosystem I Reaction Center use Photosystem I Protein Complex | 
              | Photosystem II Protein Complex | 
              | Phototherapy | 
              | Phototoxicity use Dermatitis, Phototoxic | 
              | Phototrophic Processes | 
              | Phototropins | 
              | Phototropism | 
              | Photovoltaic Cells use Solar Collectors | 
              | Photovoltaic Energy | 
              | Phrases | 
              | Phreatic Water use Groundwater | 
              | Phrenic Nerve | 
              | Phrenology | 
              | Phthalamudine use Chlorthalidone | 
              | Phthalazines | 
              | Phthalic Acids | 
              | Phthalic Anhydrides | 
              | Phthalidyl Ampicillin use Talampicillin | 
              | Phthalimides | 
              | Phthalophos use Phosmet | 
              | Phthiraptera | 
              | Phthirus | 
              | Phycobilins | 
              | Phycobiliproteins | 
              | Phycobilisomes | 
              | Phycocyanin | 
              | Phycodnaviridae | 
              | Phycoerythrin | 
              | Phycomyces | 
              | Phycomycosis use Zygomycosis | 
              | Phyllachorales | 
              | Phyllanthus | 
              | Phyllanthus emblica | 
              | Phyllobacteriaceae | 
              | Phyllodes Tumor | 
              | Phylloquinone use Vitamin K 1 | 
              | Phylloquinone Reductase use NAD(P)H Dehydrogenase (Quinone) | 
              | Phylogeny | 
              | Phylogeography | 
              | Physalaemin | 
              | Physalia pelagica | 
              | Physalia physalis use Hydrozoa | 
              | Physalis | 
              | Physalis alkekengi | 
              | Physaloptera use Spiruroidea | 
              | Physarida | 
              | Physarum | 
              | Physarum polycephalum | 
              | Physcomitrella use Bryopsida | 
              | Physeter macrocephalus use Ambra grisea | 
              | Physiatry use Physical and Rehabilitation Medicine | 
              | Physical Activity use Motor Activity | 
              | Physical Analysis | 
              | Physical and Chemical Factors | 
              | Physical and Chemical Properties | 
              | Physical and Rehabilitation Medicine | 
              | Physical Chemistry Concepts use Physicochemical Phenomena | 
              | Physical Chemistry Processes use Physicochemical Processes | 
              | Physical Chromosome Mapping | 
              | Physical Concepts use Physical Phenomena | 
              | Physical Conditioning, Animal | 
              | Physical Conditioning, Human | 
              | Physical Constitution use Biotypology | 
              | Physical Contaminants | 
              | Physical Contamination | 
              | Physical Education and Training | 
              | Physical Effort use Physical Exertion | 
              | Physical Endurance | 
              | Physical Examination | 
              | Physical Examination, Preadmission use Diagnostic Tests, Routine | 
              | Physical Exertion | 
              | Physical Fitness | 
              | Physical Mapping (Genetics) use Physical Chromosome Mapping | 
              | Physical Medicine use Physical and Rehabilitation Medicine | 
              | Physical Oceanography | 
              | Physical Phenomena | 
              | Physical Planning | 
              | Physical Processes | 
              | Physical Properties | 
              | Physical Sciences use Natural Science Disciplines | 
              | Physical Stimulation | 
              | Physical Therapist Assistants | 
              | Physical Therapists | 
              | Physical Therapy Department, Hospital | 
              | Physical Therapy Modalities | 
              | Physical Therapy Specialty | 
              | Physically Challenged use Disabled Persons | 
              | Physically Handicapped use Disabled Persons | 
              | Physician Assignment Acceptance use Medicare Assignment | 
              | Physician Assistants | 
              | Physician Executives | 
              | Physician Impairment | 
              | Physician Incentive Plans | 
              | Physician Payment Review Commission | 
              | Physician Refusal to Treat use Refusal to Treat | 
              | Physician Self-Referral | 
              | Physician Shortage Area use Medically Underserved Area | 
              | Physician's Practice Patterns | 
              | Physician's Role | 
              | Physician-Assisted Suicide use Suicide, Assisted | 
              | Physician-Hospital Organizations use Hospital-Physician Joint Ventures | 
              | Physician-Hospital Relations use Hospital-Physician Relations | 
              | Physician-Nurse Relations | 
              | Physician-Patient Relations | 
              | Physicians | 
              | Physicians Distribution | 
              | Physicians' Assistants use Physician Assistants | 
              | Physicians' Extenders use Physician Assistants | 
              | Physicians' Offices | 
              | Physicians, Family | 
              | Physicians, Junior use Medical Staff, Hospital | 
              | Physicians, Occupational Health use Occupational Health Physicians | 
              | Physicians, Primary Care | 
              | Physicians, Women | 
              | Physicist use Physics | 
              | Physicochemical Analysis | 
              | Physicochemical Concepts use Physicochemical Phenomena | 
              | Physicochemical Phenomena | 
              | Physicochemical Processes | 
              | Physicochemical Treatment | 
              | Physics | 
              | Physiognomy | 
              | Physiography | 
              | Physiologic Availability use Biological Availability | 
              | Physiological Effects of Drugs | 
              | Physiological Phenomena | 
              | Physiological Processes | 
              | Physiological Stress use Stress, Physiological | 
              | Physiology | 
              | Physiology, Comparative | 
              | Physiotherapy (Techniques) use Physical Therapy Modalities | 
              | Physostigma | 
              | Physostigma venenosum | 
              | Physostigmine | 
              | Physostigminum use Eserinum | 
              | Phytanic Acid | 
              | Phytanic Acid Storage Disease use Refsum Disease | 
              | Phytic Acid | 
              | Phytin use Phytic Acid | 
              | Phytochelatins | 
              | Phytochemicals | 
              | Phytochrome | 
              | Phytochrome A | 
              | Phytochrome B | 
              | Phytoestrogens | 
              | Phytohemagglutinins | 
              | Phytohormones use Plant Growth Regulators | 
              | Phytol | 
              | Phytolacca | 
              | Phytolacca americana | 
              | Phytolacca berry | 
              | Phytolacca decandra | 
              | Phytolacca dodecandra | 
              | Phytolacca vulgaris use Phytolacca decandra | 
              | Phytolaccaceae | 
              | Phytomenadione use Vitamin K 1 | 
              | Phytonadione use Vitamin K 1 | 
              | Phytophagineae use Plant Viruses | 
              | Phytophthora | 
              | Phytophthora infestans | 
              | Phytoplankton | 
              | Phytoplasma | 
              | Phytoremediation use Biodegradation, Environmental | 
              | Phytoreovirus use Reoviridae | 
              | Phytosterols | 
              | Phytotherapeutic Drugs | 
              | Phytotherapic Drugs use Phytotherapeutic Drugs | 
              | Phytotherapy | 
              | PI-3 Kinase use Phosphatidylinositol 3-Kinases | 
              | pi-Mesons use Mesons | 
              | Pia Mater | 
              | Pial Vein use Cerebral Veins | 
              | PIAS1 Protein Inhibitor of Activated STAT use Protein Inhibitors of Activated STAT | 
              | Pica | 
              | PICE use Disasters | 
              | Picea | 
              | Picea mariana use Abies nigra | 
              | Picea nigra use Abies nigra | 
              | Pichi use Fabiana imbricata | 
              | Pichi-pichi use Fabiana imbricata | 
              | Pichia | 
              | Pichinde virus | 
              | Picibanil | 
              | Pick Disease of the Brain | 
              | Pick's Disease of Heart use Pericarditis, Constrictive | 
              | Pickles | 
              | Pickwickian Syndrome use Obesity Hypoventilation Syndrome | 
              | Picloram | 
              | Picobirnavirus | 
              | Picodnaviruses use Parvoviridae | 
              | Picolines | 
              | Picolinic Acids | 
              | Picornaviridae | 
              | Picornaviridae Infections | 
              | Picornavirus Infections use Picornaviridae Infections | 
              | Picrasma | 
              | Picrates | 
              | Picricum Acidum | 
              | Picrophilus use Thermoplasmales | 
              | Picrorhiza | 
              | Picrotoxin | 
              | Picrotoxinum | 
              | Picryl Chloride | 
              | Picrylsulfonic Acid use Trinitrobenzenesulfonic Acid | 
              | Pictorial Works | 
              | Picture Archiving and Communication Systems use Radiology Information Systems | 
              | Picture Archiving, Radiologic use Radiology Information Systems | 
              | Picture Frustration Study use Projective Techniques | 
              | Pidolic Acid use Pyrrolidonecarboxylic Acid | 
              | Piebald Dolphins use Dolphins | 
              | Piebaldism | 
              | Piedra | 
              | Piercing, Body use Body Piercing | 
              | Pierre Robin Syndrome | 
              | Piezosurgery | 
              | Pig Skin Dressings use Biological Dressings | 
              | Pig's Knee use Achyranthes calea | 
              | Pig, Domestic use Sus scrofa | 
              | Pig-Tailed Monkey use Macaca nemestrina | 
              | Pigeon Breeder's Lung use Bird Fancier's Lung | 
              | Pigeonpea Plant use Cajanus | 
              | Pigeonpox virus use Avipoxvirus | 
              | Pigeons use Columbidae | 
              | Pigment Epithelium of Eye | 
              | Pigmentary Pallidal Degeneration use Pantothenate Kinase-Associated Neurodegeneration | 
              | Pigmentary Retinopathy use Retinitis Pigmentosa | 
              | Pigmentation | 
              | Pigmentation Disorders | 
              | Pigments, Biological | 
              | Pigs use Swine | 
              | PII Nitrogen Regulatory Proteins | 
              | Pijiguao use Arecaceae | 
              | Pikas use Lagomorpha | 
              | Pike use Esocidae | 
              | Pilar Cyst use Epidermal Cyst | 
              | Pili, Bacterial use Fimbriae, Bacterial | 
              | Pili, Common use Fimbriae, Bacterial | 
              | Pili, Conjugative use Pili, Sex | 
              | Pili, Sex | 
              | Pilin use Fimbriae Proteins | 
              | Pill-pod Sandmat use Euphorbia pilulifera | 
              | Pillpod Sandmat use Euphorbia pilulifera | 
              | Pilocarpine | 
              | Pilocarpinum | 
              | Pilocarpus | 
              | Pilocarpus microphyllus use Jaborandi | 
              | Pilocarpus pennatifolius use Jaborandi | 
              | Piloerection | 
              | Pilomatrixoma | 
              | Pilonidal Cyst use Pilonidal Sinus | 
              | Pilonidal Sinus | 
              | Pilot Lot of Drugs use Drug Samples | 
              | Pilot Plants | 
              | Pilot Projects | 
              | Pilot Whales use Whales, Pilot | 
              | pim-1 Proto-Oncogene Protein use Proto-Oncogene Proteins c-pim-1 | 
              | Pimaricin use Natamycin | 
              | Pimelic Acids | 
              | Pimenta | 
              | Pimenta officinalis | 
              | Pimiento use Capsicum | 
              | Pimozide | 
              | Pimpernel use Anagallis | 
              | Pimpinella | 
              | Pimpinella alba use Pimpinella saxifraga | 
              | Pimpinella anisum use Pimpinella | 
              | Pimpinella saxifraga | 
              | Pinaceae | 
              | Pinacidil | 
              | Pinch Strength | 
              | Pinctada | 
              | Pindolol | 
              | Pine Tree use Pinus | 
              | Pine, Loblolly use Pinus taeda | 
              | Pineal Body use Pineal Gland | 
              | Pineal Gland | 
              | Pineal Neoplasms use Pinealoma | 
              | Pinealocytoma use Pinealoma | 
              | Pinealoma | 
              | Pineapple use Ananas | 
              | Pineapple Guava use Feijoa | 
              | Pineapple Weed use Matricaria | 
              | Pinellia | 
              | Pinemat Manzanita use Uva ursi (Homeopathy) | 
              | Pineoblastoma use Pinealoma | 
              | Pineocytoma use Pinealoma | 
              | Pinguecula | 
              | Pink Disease use Acrodynia | 
              | Pink River Dolphin use Delphinus amazonicus | 
              | Pinkroot use Spigelia marylandica | 
              | Pinna, Ear use Ear Auricle | 
              | Pinnipedia | 
              | Pinnipeds use Pinnipedia | 
              | Pinocytosis | 
              | Pinta | 
              | Pinus | 
              | Pinus canadensis use Abies canadensis | 
              | Pinus cupressus | 
              | Pinus lambertiana | 
              | Pinus nigra use Abies nigra | 
              | Pinus ponderosa | 
              | Pinus silvestris | 
              | Pinus sylvestris | 
              | Pinus taeda | 
              | Pinworms use Enterobius | 
              | Pions use Mesons | 
              | Pipe Fitting use Plumbing (Environmental Health) | 
              | Pipe Laying | 
              | Pipe Networks use Sewerage | 
              | Pipe Smoking use Smoking | 
              | Pipecolic Acids | 
              | Pipecurium use Pipecuronium | 
              | Pipecuronium | 
              | Pipelines | 
              | Pipemidic Acid | 
              | Piper | 
              | Piper angustifolium use Matico | 
              | Piper betle | 
              | Piper methysticum use Kava | 
              | Piper methysticum (Homeopathy) | 
              | Piper nigrum | 
              | Piperaceae | 
              | Piperacillin | 
              | Piperamic Acid use Pipemidic Acid | 
              | Piperazines | 
              | Piperazinum | 
              | Piperidines | 
              | Piperidones | 
              | Piperonyl Butoxide | 
              | Piperoxan | 
              | Pipes use Pipelines | 
              | Pipidae | 
              | Piping use Pipelines | 
              | Pipobroman | 
              | Pipsissewa use Chimaphila umbellata | 
              | Piracetam | 
              | Piracy | 
              | Pirenzepine | 
              | Piribedil | 
              | Piribendyl use Piribedil | 
              | Piriform Cortex | 
              | Piriformis Muscle Syndrome | 
              | Pirinitramide | 
              | Piritramid use Pirinitramide | 
              | Piritramide use Pirinitramide | 
              | Piromidic Acid | 
              | Piromonas use Piromyces | 
              | Piromyces | 
              | Piroplasma use Babesia | 
              | Piroplasmia | 
              | Piroplasmida | 
              | Piroplasmosis use Babesiosis | 
              | Piroxicam | 
              | Pirul use Schinus molle | 
              | Piscidia erythrina | 
              | Piscirickettsia | 
              | Piscirickettsiaceae | 
              | Piscirickettsiaceae Infections | 
              | Piscirickettsiosis use Piscirickettsiaceae Infections | 
              | Pisiform Bone | 
              | Pistachio use Pistacia | 
              | Pistacia | 
              | Pistia use Araceae | 
              | Pistil use Flowers | 
              | Piston Pumps use Positive Displacement Pumps | 
              | Pisum sativum use Peas | 
              | Pit and Fissure Sealants | 
              | Pit Latrines use Latrines (Environmental Health) | 
              | Pit Viper Venoms use Crotalid Venoms | 
              | Pitcairn Island | 
              | Pitch Discrimination | 
              | Pitch Perception | 
              | Pitcheri use Duboisia hopwoodi | 
              | Pitcherplant use Sarraceniaceae | 
              | Pitchuri Thornapple use Duboisia hopwoodi | 
              | Pithecia use Pitheciidae | 
              | Pitheciidae | 
              | Pitheciinae use Pitheciidae | 
              | Pithecolobium use Fabaceae | 
              | Pitometry | 
              | Pittosporaceae use Rosales | 
              | Pittosporum use Rosales | 
              | Pituitaria glandula | 
              | Pituitarium posterium | 
              | Pituitary ACTH Hypersecretion | 
              | Pituitary Adenoma, ACTH-Secreting use ACTH-Secreting Pituitary Adenoma | 
              | Pituitary Adenoma, GH-Secreting use Growth Hormone-Secreting Pituitary Adenoma | 
              | Pituitary Adenoma, Prolactin-Secreting use Prolactinoma | 
              | Pituitary Adenylate Cyclase-Activating Peptide Receptor Type I use Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I | 
              | Pituitary Adenylate Cyclase-Activating Peptide Receptor Type II use Receptors, Vasoactive Intestinal Polypeptide, Type I | 
              | Pituitary Adenylate Cyclase-Activating Peptide Receptor Type III use Receptors, Vasoactive Intestinal Peptide, Type II | 
              | Pituitary Adenylate Cyclase-Activating Peptide Receptors use Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide | 
              | Pituitary Adenylate Cyclase-Activating Polypeptide | 
              | Pituitary Adrenocorticotropin-Secreting Cells use Corticotrophs | 
              | Pituitary Apoplexy | 
              | Pituitary Cancer use Pituitary Neoplasms | 
              | Pituitary Corticotropin-Secreting Adenoma use ACTH-Secreting Pituitary Adenoma | 
              | Pituitary Diencephalic Syndrome use Hypothalamic Diseases | 
              | Pituitary Diseases | 
              | Pituitary Dwarf use Dwarfism, Pituitary | 
              | Pituitary Function Tests | 
              | Pituitary Gland | 
              | Pituitary Gland, Anterior | 
              | Pituitary Gland, Intermediate | 
              | Pituitary Gland, Posterior | 
              | Pituitary Glycoprotein Hormone, alpha Subunit use Glycoprotein Hormones, alpha Subunit | 
              | Pituitary Gonadotropin Receptors use Receptors, Gonadotropin | 
              | Pituitary Growth Hormone use Growth Hormone | 
              | Pituitary Growth Hormone-Secreting Adenoma use Growth Hormone-Secreting Pituitary Adenoma | 
              | Pituitary Growth Hormone-Secreting Cells use Somatotrophs | 
              | Pituitary Hormone Receptors use Receptors, Pituitary Hormone | 
              | Pituitary Hormone Release Inhibiting Hormones | 
              | Pituitary Hormone-Regulating Hormone Receptors use Receptors, Pituitary Hormone-Regulating Hormone | 
              | Pituitary Hormone-Releasing Hormone Receptors use Receptors, Pituitary Hormone-Regulating Hormone | 
              | Pituitary Hormone-Releasing Hormones | 
              | Pituitary Hormones | 
              | Pituitary Hormones, Anterior | 
              | Pituitary Hormones, Posterior | 
              | Pituitary Irradiation | 
              | Pituitary Melanotropin-Producing Cells use Melanotrophs | 
              | Pituitary Neoplasms | 
              | Pituitary Prolactin-Secreting Cells use Lactotrophs | 
              | Pituitary Stalk use Pituitary Gland | 
              | Pituitary TSH-Secreting Cells use Thyrotrophs | 
              | Pituitary-Adrenal Function Tests | 
              | Pituitary-Adrenal System | 
              | Pituitrin use Pituitary Hormones, Posterior | 
              | Pituitrinum | 
              | Pituri use Duboisia hopwoodi | 
              | Pityriasis | 
              | Pityriasis Lichenoides | 
              | Pityriasis Lichenoides Chronica use Pityriasis Lichenoides | 
              | Pityriasis Lichenoides et Varioliformis Acuta use Pityriasis Lichenoides | 
              | Pityriasis Rosea | 
              | Pityriasis Rubra Pilaris | 
              | Pityriasis Versicolor use Tinea Versicolor | 
              | Pityrosporum use Malassezia | 
              | Pivampicillin | 
              | Pivmecillinam use Amdinocillin Pivoxil | 
              | Piwi-Interacting RNA use RNA, Small Interfering | 
              | Pix Liquida | 
              | Pizotifen use Pizotyline | 
              | Pizotyline | 
              | PKC Serine-Threonine Kinase use Protein Kinase C | 
              | PKC-alpha Serine-Threonine Kinase use Protein Kinase C-alpha | 
              | PKC-delta Serine-Threonine Kinase use Protein Kinase C-delta | 
              | PL 104-191 use Health Insurance Portability and Accountability Act | 
              | Placebo Effect | 
              | Placebos | 
              | Placenta | 
              | Placenta Accreta | 
              | Placenta Diseases | 
              | Placenta Previa | 
              | Placenta, Retained | 
              | Placental Abruption use Abruptio Placentae | 
              | Placental Anticoagulant Protein I use Annexin A5 | 
              | Placental Anticoagulant Protein II use Annexin A4 | 
              | Placental Anticoagulant Protein III use Annexin A3 | 
              | Placental Circulation | 
              | Placental Extracts | 
              | Placental Function Tests | 
              | Placental Hormones | 
              | Placental Insufficiency | 
              | Placental Lactogen | 
              | Placental Proteins use Pregnancy Proteins | 
              | Placental Villi use Chorionic Villi | 
              | Placental-Site Trophoblastic Tumor use Trophoblastic Tumor, Placental Site | 
              | Placentation | 
              | Placentoma, Normal use Placenta | 
              | Placentome use Placenta | 
              | Places for Smoking use Smoking Areas | 
              | Placozoa | 
              | Plagiarism | 
              | Plagiocephaly | 
              | Plagiocephaly, Nonsynostotic | 
              | Plague | 
              | Plague Vaccine | 
              | Plaice use Flounder | 
              | Plain Sedimentation use Sedimentation | 
              | Plakins | 
              | Plakophilins | 
              | Plakortis | 
              | Plan Director of Civil Defense | 
              | Planarians | 
              | Planctomycetales | 
              | Planetary Evolution use Evolution, Planetary | 
              | Planetoids use Minor Planets | 
              | Planets | 
              | Planets, Minor use Minor Planets | 
              | Plankton | 
              | Planned Parenthood use Family Planning (Public Health) | 
              | Planning | 
              | Planning systems use Planning | 
              | Planning Techniques | 
              | Planning Theories use Planning Techniques | 
              | Planning, Health and Welfare use Health Planning | 
              | Planning, Health Facility use Health Facility Planning | 
              | Planococcaceae | 
              | Planococcus Bacteria | 
              | Planococcus Insect | 
              | Plans | 
              | Plans and Programs use Programming | 
              | Plans and Programs of Education in Disasters | 
              | Plant Alkaloids use Alkaloids | 
              | Plant Antibodies, Recombinant use Plantibodies | 
              | Plant Antigens use Antigens, Plant | 
              | Plant Aril use Fruit | 
              | Plant Bark | 
              | Plant Beverage use Juices | 
              | Plant Beverages use Juices | 
              | Plant Capsule use Fruit | 
              | Plant Cells | 
              | Plant Components use Plant Structures | 
              | Plant Components, Aerial | 
              | Plant Creams | 
              | Plant Development | 
              | Plant Diseases | 
              | Plant Dispersal | 
              | Plant DNA use DNA, Plant | 
              | Plant Dormancy | 
              | Plant Embryos use Seeds | 
              | Plant Epidermis | 
              | Plant Equipment | 
              | Plant Extracts | 
              | Plant Extracts, Chinese use Drugs, Chinese Herbal | 
              | Plant Exudates | 
              | Plant Galls use Plant Tumors | 
              | Plant Gene Expression Regulation use Gene Expression Regulation, Plant | 
              | Plant Genes use Genes, Plant | 
              | Plant Genome use Genome, Plant | 
              | Plant Growth Regulators | 
              | Plant Gums | 
              | Plant Hormones use Plant Growth Regulators | 
              | Plant Immunity | 
              | Plant Infertility | 
              | Plant Juice use Juices | 
              | Plant Juices use Juices | 
              | Plant Leaves | 
              | Plant Lectins | 
              | Plant Lice use Aphids | 
              | Plant Magnetism use Complementary Therapies | 
              | Plant Mucilage | 
              | Plant Nectar | 
              | Plant Oils | 
              | Plant Pathology | 
              | Plant Physiological Phenomena | 
              | Plant Physiological Processes | 
              | Plant Physiology use Plant Physiological Phenomena | 
              | Plant Poisoning | 
              | Plant Preparations | 
              | Plant Proteins | 
              | Plant Proteins, Dietary use Vegetable Proteins | 
              | Plant Purees use Plant Creams | 
              | Plant RNA use RNA, Plant | 
              | Plant Root Cap | 
              | Plant Root Nodulation | 
              | Plant Roots | 
              | Plant Shoots | 
              | Plant Somatic Embryogenesis Techniques | 
              | Plant Stems | 
              | Plant Sterols use Phytosterols | 
              | Plant Stomata | 
              | Plant Structures | 
              | Plant Style use Flowers | 
              | Plant Transpiration | 
              | Plant Tubers | 
              | Plant Tumor-Inducing Plasmids | 
              | Plant Tumors | 
              | Plant Vascular Bundle | 
              | Plant Viral Movement Proteins | 
              | Plant Viruses | 
              | Plant Weeds | 
              | Plant Zygotes use Seeds | 
              | Plant-Lice from Chenopodium use Aphis Chenopodii Glauci | 
              | Plantago | 
              | Plantago major | 
              | Plantago minor | 
              | Plantago officinarum use Plantago major | 
              | Plantain use Plantago | 
              | Plantar Fasciitis use Fasciitis, Plantar | 
              | Plantar Prints use Dermatoglyphics | 
              | Plantar Ulcer use Foot Ulcer | 
              | Plantaris Muscle use Muscle, Skeletal | 
              | Plantation (area) use Agricultural Cultivation | 
              | Plantation (produce) use Crops, Agricultural | 
              | Plantibodies | 
              | Planting use Agricultural Cultivation | 
              | Plants | 
              | Plants, Edible | 
              | Plants, Genetically Modified | 
              | Plants, Medicinal | 
              | Plants, Salt-Tolerant use Salt-Tolerant Plants | 
              | Plants, Toxic | 
              | Plants, Transgenic use Plants, Genetically Modified | 
              | Plaque Therapy, Radioisotope use Brachytherapy | 
              | Plaque, Amyloid | 
              | Plaque, Atherosclerotic | 
              | Plaques, Amyloid use Plaque, Amyloid | 
              | Plasma | 
              | Plasma Albumin use Serum Albumin | 
              | Plasma Cell Antigens PC-1 use Antigens, Differentiation, B-Lymphocyte | 
              | Plasma Cell Dyscrasias use Paraproteinemias | 
              | Plasma Cell Granuloma use Granuloma, Plasma Cell | 
              | Plasma Cell Granuloma, Pulmonary | 
              | Plasma Cell Leukemia use Leukemia, Plasma Cell | 
              | Plasma Cell Neoplasms use Neoplasms, Plasma Cell | 
              | Plasma Cell Tumor use Plasmacytoma | 
              | Plasma Cells | 
              | Plasma Exchange | 
              | Plasma Flow, Renal use Renal Plasma Flow | 
              | Plasma Flow, Renal, Effective use Renal Plasma Flow, Effective | 
              | Plasma Gases | 
              | Plasma Kallikrein | 
              | Plasma Membrane use Cell Membrane | 
              | Plasma Membrane Calcium-Transporting ATPases | 
              | Plasma Membrane Neurotransmitter Transport Proteins | 
              | Plasma Prokallikrein use Prekallikrein | 
              | Plasma Proteins use Blood Proteins | 
              | Plasma Skin Regeneration | 
              | Plasma Skin Rejuvenation use Plasma Skin Regeneration | 
              | Plasma Skin Resurfacing use Plasma Skin Regeneration | 
              | Plasma Substitutes | 
              | Plasma Thromboplastin Antecedent use Factor XI | 
              | Plasma Thromboplastin Component use Factor IX | 
              | Plasma Transglutaminase use Factor XIIIa | 
              | Plasma Volume | 
              | Plasma Volume Expanders use Plasma Substitutes | 
              | Plasma-Derived Medicines use Blood-Derivative Drugs | 
              | Plasmacytes use Plasma Cells | 
              | Plasmacytic Leukemia use Leukemia, Plasma Cell | 
              | Plasmacytoid Dendritic Cells use Dendritic Cells | 
              | Plasmacytoma | 
              | Plasmacytoma Growth Factor use Interleukin-6 | 
              | Plasmalogens | 
              | Plasmapheresis | 
              | Plasmids | 
              | Plasmin use Fibrinolysin | 
              | Plasminogen | 
              | Plasminogen Activator Inhibitor 1 | 
              | Plasminogen Activator Inhibitor 2 | 
              | Plasminogen Activator Inhibitor 3 use Protein C Inhibitor | 
              | Plasminogen Activator Inhibitors use Plasminogen Inactivators | 
              | Plasminogen Activator, Tissue-Type use Tissue Plasminogen Activator | 
              | Plasminogen Activator, Urokinase-Type use Urokinase-Type Plasminogen Activator | 
              | Plasminogen Activators | 
              | Plasminogen Inactivators | 
              | Plasmodesmata | 
              | Plasmodiophora use Plasmodiophorida | 
              | Plasmodiophorida | 
              | Plasmodium | 
              | Plasmodium berghei | 
              | Plasmodium chabaudi | 
              | Plasmodium cynomolgi | 
              | Plasmodium falciparum | 
              | Plasmodium falciparum Malaria use Malaria, Falciparum | 
              | Plasmodium gallinaceum | 
              | Plasmodium Infections use Malaria | 
              | Plasmodium knowlesi | 
              | Plasmodium malariae | 
              | Plasmodium ovale | 
              | Plasmodium vivax | 
              | Plasmodium vivax Malaria use Malaria, Vivax | 
              | Plasmodium yoelii | 
              | Plasmosome use Cell Nucleolus | 
              | Plaster Casts use Casts, Surgical | 
              | Plaster of Paris use Calcium Sulfate | 
              | Plastic Bags for Blood Collection and Packing of Human Blood use Plastic Bags for Blood Preservation | 
              | Plastic Bags for Blood Preservation | 
              | Plastic Casts use Casts, Surgical | 
              | Plastic Embedding | 
              | Plastic Pipes use PVC Pipes | 
              | Plastic Surgery use Surgery, Plastic | 
              | Plasticity, Neuronal use Neuronal Plasticity | 
              | Plasticizers | 
              | Plastics | 
              | Plastics Industry | 
              | Plastids | 
              | Plastocyanin | 
              | Plastoquinol-Plastocyanin Reductase | 
              | Plastoquinone | 
              | Platanista use Dolphins | 
              | Platanna use Xenopus laevis | 
              | Platanus occidentalis | 
              | Plate Sedimentation use Accelerated Sedimentation | 
              | Platelet Activating Factor | 
              | Platelet Activation | 
              | Platelet Adhesiveness | 
              | Platelet Aggregation | 
              | Platelet Aggregation Inhibitors | 
              | Platelet Alloantigens use Antigens, Human Platelet | 
              | Platelet alpha-Granule Membrane Protein use P-Selectin | 
              | Platelet Antagonists use Platelet Aggregation Inhibitors | 
              | Platelet Antiaggregants use Platelet Aggregation Inhibitors | 
              | Platelet Count | 
              | Platelet Endothelial Cell Adhesion Molecule-1 use Antigens, CD31 | 
              | Platelet Factor 3 | 
              | Platelet Factor 4 | 
              | Platelet Function Tests | 
              | Platelet Glycoprotein GPIb-IX Complex | 
              | Platelet Glycoprotein GPIIb-IIIa Complex | 
              | Platelet Glycoprotein IV use Antigens, CD36 | 
              | Platelet Membrane Glycoprotein Ib use Platelet Glycoprotein GPIb-IX Complex | 
              | Platelet Membrane Glycoprotein IIb | 
              | Platelet Membrane Glycoprotein IIIa use Integrin beta3 | 
              | Platelet Membrane Glycoprotein IIIb use Antigens, CD36 | 
              | Platelet Membrane Glycoprotein IX use Platelet Glycoprotein GPIb-IX Complex | 
              | Platelet Membrane Glycoprotein V use Platelet Glycoprotein GPIb-IX Complex | 
              | Platelet Membrane Glycoproteins | 
              | Platelet Number use Platelet Count | 
              | Platelet Storage Pool Deficiency | 
              | Platelet Transforming Growth Factor use Transforming Growth Factor beta | 
              | Platelet Transfusion | 
              | Platelet-Activating Factor Hydrolase use 1-Alkyl-2-acetylglycerophosphocholine Esterase | 
              | Platelet-Derived Endothelial Cell Growth Factor use Thymidine Phosphorylase | 
              | Platelet-Derived Growth Factor | 
              | Platelet-Derived Growth Factor alpha Receptor use Receptor, Platelet-Derived Growth Factor alpha | 
              | Platelet-Derived Growth Factor B use Proto-Oncogene Proteins c-sis | 
              | Platelet-Derived Growth Factor beta Receptor use Receptor, Platelet-Derived Growth Factor beta | 
              | Platelet-Derived Growth Factor Receptors use Receptors, Platelet-Derived Growth Factor | 
              | Platelet-Rich Plasma | 
              | Platelet-Specific Antigens use Antigens, Human Platelet | 
              | Plateletpheresis | 
              | Platelets use Blood Platelets | 
              | Platichthys use Flounder | 
              | Platinum | 
              | Platinum Black use Platinum | 
              | Platinum Compounds | 
              | Platinum Compounds, Inorganic use Platinum Compounds | 
              | Platinum Diamminodichloride use Cisplatin | 
              | Platinum Metallicum | 
              | Platinum Muriaticum | 
              | Platinum Muriaticum Natronatum | 
              | Platybasia | 
              | Platycodon | 
              | Platyfish use Cyprinodontiformes | 
              | Platyhelminths | 
              | Platypus | 
              | Platyrrhina use Cebidae | 
              | Platyrrhini | 
              | Play and Playthings | 
              | Play Therapy | 
              | Pleasure | 
              | Pleasure-Pain Principle | 
              | Plectin | 
              | Plectonema | 
              | Plectranthus | 
              | Plectranthus fruticosus | 
              | Plectrovirus | 
              | Plegia use Paralysis | 
              | Pleistophora | 
              | Pleocytosis use Leukocytosis | 
              | Pleoptics use Orthoptics | 
              | Plerocercoid Larvae use Sparganum | 
              | Plesiomonas | 
              | Plesiomonas shigelloides use Plesiomonas | 
              | Plethysmography | 
              | Plethysmography, Impedance | 
              | Plethysmography, Impedance, Transthoracic use Cardiography, Impedance | 
              | Plethysmography, Whole Body | 
              | Pleura | 
              | Pleural Cavity | 
              | Pleural Diseases | 
              | Pleural Effusion | 
              | Pleural Effusion, Malignant | 
              | Pleural Endoscopy use Thoracoscopy | 
              | Pleural Neoplasms | 
              | Pleural Rub use Respiratory Sounds | 
              | Pleurisy | 
              | Pleurisy Root use Asclepias tuberosa | 
              | Pleurisy, Tuberculous use Tuberculosis, Pleural | 
              | Pleurobranchaea | 
              | Pleurodeles | 
              | Pleurodesis | 
              | Pleurodynia Virus use Enterovirus B, Human | 
              | Pleurodynia, Epidemic | 
              | Pleuronectes use Flounder | 
              | Pleuronectiformes use Flatfishes | 
              | Pleuropneumonia | 
              | Pleuropneumonia, Contagious | 
              | Pleuropneumonia-Like Organisms use Mycoplasma | 
              | Pleuroscopy use Thoracoscopy | 
              | Pleurotus | 
              | Plexus Coeliacus use Celiac Plexus | 
              | Pliability | 
              | Plicamycin | 
              | Plocamium | 
              | Ploidies | 
              | Plotosus use Catfishes | 
              | Plugs, Surgical use Surgical Instruments | 
              | Plum use Prunus | 
              | Plum Pox Virus | 
              | Plum Tree use Prunus | 
              | Plum, Waika use Clusiaceae | 
              | Plumbaginaceae | 
              | Plumbago use Plumbaginaceae | 
              | Plumbago litteralis | 
              | Plumbing use Sanitary Engineering | 
              | Plumbing (Environmental Health) | 
              | Plumbing Accessories | 
              | Plumbism, Nervous System use Lead Poisoning, Nervous System | 
              | Plumbism, Neurologic use Lead Poisoning, Nervous System | 
              | Plumbism, Neurologic, Adult use Lead Poisoning, Nervous System, Adult | 
              | Plumbism, Neurologic, Childhood use Lead Poisoning, Nervous System, Childhood | 
              | Plumbum Aceticum | 
              | Plumbum Carbonicum | 
              | Plumbum Chromicum | 
              | Plumbum Iodatum | 
              | Plumbum Metallicum | 
              | Plumbum Nitricum | 
              | Plumbum Phosphoricum | 
              | Plume Bush use Humea elegans | 
              | Plumeria use Apocynaceae | 
              | Plumeria celinus | 
              | Plumes use Feathers | 
              | Plummer-Vinson Syndrome | 
              | Pluralism use Cultural Diversity | 
              | Pluralism (Homeopathy) | 
              | Pluripotent Stem Cells | 
              | Plus Method | 
              | Pluto | 
              | Plutoids use Minor Planets | 
              | Plutonium | 
              | Pluviometry | 
              | Plyometric Exercise | 
              | PM2 Bacteriophage use Corticoviridae | 
              | PMMA use Polymethyl Methacrylate | 
              | PMN Elastase use Leukocyte Elastase | 
              | PMP use Probable Maximum Precipitation | 
              | PNET use Neuroectodermal Tumors, Primitive | 
              | Pneumatic Compression Stockings use Intermittent Pneumatic Compression Devices | 
              | Pneumatic Suits use Gravity Suits | 
              | Pneumatic Systems use Pressure Systems | 
              | Pneumatosis Cystoides Intestinalis | 
              | Pneumocephalus | 
              | Pneumocephalus, Tension use Pneumocephalus | 
              | Pneumococcal Infections | 
              | Pneumococcal Polysaccharide Vaccine use Pneumococcal Vaccines | 
              | Pneumococcal Vaccines | 
              | Pneumococcinum | 
              | Pneumococcus use Streptococcus pneumoniae | 
              | Pneumoconiogenic Particles | 
              | Pneumoconiosis | 
              | Pneumocystis | 
              | Pneumocystis carinii | 
              | Pneumocystis Infections | 
              | Pneumocystis jirovecii | 
              | Pneumocystis Pneumonia use Pneumonia, Pneumocystis | 
              | Pneumocystosis use Pneumonia, Pneumocystis | 
              | Pneumocytes | 
              | Pneumoencephalography | 
              | Pneumogastric Nerve use Vagus Nerve | 
              | Pneumogastric Nerve Disorders use Vagus Nerve Diseases | 
              | Pneumology use Pulmonary Medicine | 
              | Pneumomediastinum use Mediastinal Emphysema | 
              | Pneumomediastinum, Diagnostic | 
              | Pneumonectomy | 
              | Pneumonia | 
              | Pneumonia of Calves, Enzootic | 
              | Pneumonia of Swine, Enzootic use Pneumonia of Swine, Mycoplasmal | 
              | Pneumonia of Swine, Mycoplasmal | 
              | Pneumonia Virus of Mice use Murine pneumonia virus | 
              | Pneumonia, Aspiration | 
              | Pneumonia, Atypical Interstitial, of Cattle | 
              | Pneumonia, Bacterial | 
              | Pneumonia, Eosinophilic use Pulmonary Eosinophilia | 
              | Pneumonia, Interstitial use Lung Diseases, Interstitial | 
              | Pneumonia, Interstitial Plasma Cell use Pneumonia, Pneumocystis | 
              | Pneumonia, Lipid | 
              | Pneumonia, Lobar use Pneumonia | 
              | Pneumonia, Mycoplasma | 
              | Pneumonia, Pneumococcal | 
              | Pneumonia, Pneumocystis | 
              | Pneumonia, Primary Atypical use Pneumonia, Mycoplasma | 
              | Pneumonia, Progressive Interstitial, of Sheep | 
              | Pneumonia, Radiation use Radiation Pneumonitis | 
              | Pneumonia, Rickettsial | 
              | Pneumonia, Staphylococcal | 
              | Pneumonia, Ventilator-Associated | 
              | Pneumonia, Viral | 
              | Pneumonic Plague use Plague | 
              | Pneumonitis use Pneumonia | 
              | Pneumonitis, Hypersensitivity use Alveolitis, Extrinsic Allergic | 
              | Pneumonitis, Hypersensitivity, Avian use Bird Fancier's Lung | 
              | Pneumonitis, Interstitial use Lung Diseases, Interstitial | 
              | Pneumonitis, Radiation use Radiation Pneumonitis | 
              | Pneumonology use Pulmonary Medicine | 
              | Pneumonolysis | 
              | Pneumopericardium | 
              | Pneumoperitoneum | 
              | Pneumoperitoneum, Artificial | 
              | Pneumoradiography | 
              | Pneumoretroperitoneum use Retropneumoperitoneum | 
              | Pneumorrhachis | 
              | Pneumothorax | 
              | Pneumothorax, Artificial | 
              | Pneumovirinae | 
              | Pneumovirus | 
              | Pneumovirus Infections | 
              | Pneumovirus, Avian use Metapneumovirus | 
              | Pneumus boldus use Boldo (Homeopathy) | 
              | Poa | 
              | Poaceae | 
              | Pocket, Gingival use Gingival Pocket | 
              | Pocket, Periodontal use Periodontal Pocket | 
              | Podalyria tinctoria use Baptisia tinctoria | 
              | Podiatry | 
              | Podocytes | 
              | Podophyllin | 
              | Podophyllotoxin | 
              | Podophyllum | 
              | Podophyllum peltatum | 
              | Podospora | 
              | Podoviridae | 
              | Poecilia | 
              | POEMS Syndrome | 
              | Poet's Jasmine use Jasminum officinale | 
              | Poetry | 
              | Poetry as Topic | 
              | Poikiloderma Congenitale use Rothmund-Thomson Syndrome | 
              | Point Mutation | 
              | Point of Care Technology use Point-of-Care Systems | 
              | Point of Service Regulations use Patient Freedom of Choice Laws | 
              | Point Source | 
              | Point Source Storm | 
              | Point Sources | 
              | Point-of-Care Systems | 
              | Poison Control Centers | 
              | Poison Elder use Rhus venenata | 
              | Poison Hemlock use Conium | 
              | Poison Ivy use Toxicodendron | 
              | Poison Ivy Dermatitis use Dermatitis, Toxicodendron | 
              | Poison Oak use Toxicodendron | 
              | Poison Parsley use Aethusa cynapium | 
              | Poison Sumac use Toxicodendron | 
              | Poison Sumach use Toxicodendron | 
              | Poison-Rope Swallowwort use Vincetoxicum officinale | 
              | Poisonberry use Dulcamara (Homeopathy) | 
              | Poisonflower use Dulcamara (Homeopathy) | 
              | Poisoning | 
              | Poisoning, Heavy Metals, Nervous System use Heavy Metal Poisoning, Nervous System | 
              | Poisoning, Lead, Nervous System use Lead Poisoning, Nervous System | 
              | Poisoning, Lead, Nervous System, Adult use Lead Poisoning, Nervous System, Adult | 
              | Poisoning, Lead, Nervous System, Childhood use Lead Poisoning, Nervous System, Childhood | 
              | Poisoning, Lead, Neurologic use Lead Poisoning, Nervous System | 
              | Poisoning, Lead, Neurologic, Adult use Lead Poisoning, Nervous System, Adult | 
              | Poisoning, Lead, Neurologic, Childhood use Lead Poisoning, Nervous System, Childhood | 
              | Poisoning, Mercury, Nervous System use Mercury Poisoning, Nervous System | 
              | Poisoning, Mercury, Neurologic use Mercury Poisoning, Nervous System | 
              | Poisoning, Nervous System use Neurotoxicity Syndromes | 
              | Poisonous Wastes use Toxic Wastes | 
              | Poisons | 
              | Poisson Distribution | 
              | Pokeweed use Phytolacca americana | 
              | Pokeweed Lectins use Pokeweed Mitogens | 
              | Pokeweed Mitogens | 
              | pol Gene Products use Gene Products, pol | 
              | pol Gene Products, Human Immunodeficiency Virus | 
              | pol Genes use Genes, pol | 
              | Pol I Transcription Initiation Complex Proteins use Pol1 Transcription Initiation Complex Proteins | 
              | pol Polyproteins use Gene Products, pol | 
              | pol Protein use Gene Products, pol | 
              | Pol1 Transcription Initiation Complex Proteins | 
              | Poland | 
              | Poland Syndrome | 
              | Polar Air | 
              | Polar Bears use Ursidae | 
              | Polar Bodies | 
              | Polar Front | 
              | Polar Recombination use Gene Conversion | 
              | Polar Regions use Cold Climate | 
              | Polarcardiography use Vectorcardiography | 
              | Polarity of Development use Body Patterning | 
              | Polarization Fluoroimmunoassay use Fluorescence Polarization Immunoassay | 
              | Polarization Microscopy use Microscopy, Polarization | 
              | Polarization, Fluorescence use Fluorescence Polarization | 
              | Polarography | 
              | Polaron use Gene Conversion | 
              | Polder | 
              | Polecat Weed use Ictodes foetida | 
              | Polemonium coeruleum | 
              | Polerovirus use Luteoviridae | 
              | Police | 
              | Police Power | 
              | Policies and Cooperation in Science, Technology and Innovation | 
              | Policy | 
              | Policy Compliance use Guideline Adherence | 
              | Policy Making | 
              | Polio use Poliomyelitis | 
              | Poliodystrophia Cerebri use Diffuse Cerebral Sclerosis of Schilder | 
              | Poliomyelitis | 
              | Poliomyelitis, Bulbar | 
              | Poliomyelitis, Nonpoliovirus use Poliomyelitis | 
              | Poliomyelitis, Porcine use Encephalomyelitis, Enzootic Porcine | 
              | Poliomyelitis, Preparalytic use Poliomyelitis | 
              | Poliovirus | 
              | Poliovirus Vaccine, Inactivated | 
              | Poliovirus Vaccine, Oral | 
              | Poliovirus Vaccines | 
              | Polioviruses, Murine use Theilovirus | 
              | Polish Drying Accelerator use Products for Nails and Cuticles | 
              | Polishers use Polishes (Health Surveillance) | 
              | Polishes use Industrial Oils | 
              | Polishes (Health Surveillance) | 
              | Polishes, Dental use Dentifrices | 
              | Polishing Lagoons use Maturing Lagoons | 
              | Politef use Polytetrafluoroethylene | 
              | Political Activity use Politics | 
              | Political Asylum use Asylum | 
              | Political Decisions use Policy | 
              | Political Factors | 
              | Political Systems | 
              | Politics | 
              | Pollack Whale use Balaenoptera | 
              | Pollen | 
              | Pollen (Homeopathy) | 
              | Pollen Allergy use Rhinitis, Allergic, Seasonal | 
              | Pollen Tube | 
              | Pollination | 
              | Pollinosis use Rhinitis, Allergic, Seasonal | 
              | Pollutant Removal use Contaminant Removal | 
              | Pollutants | 
              | Pollutants Dispersion | 
              | Pollutants Propagation use Pollutants Dispersion | 
              | Pollutants Transport | 
              | Polluter Pays use Polluter-Pays Principle | 
              | Polluter-Pays Criterion use Polluter-Pays Principle | 
              | Polluter-Pays Principle | 
              | Pollution use Environmental Pollution | 
              | Pollution Control Measures use Environmental Contamination Control | 
              | Pollution Indicators | 
              | Pollution Prevention use Environmental Contamination Control | 
              | Pollution Reduction use Environmental Contamination Control | 
              | Pollution Remediation use Environmental Restoration and Remediation | 
              | Polonium | 
              | Poloxalene | 
              | Poloxamer | 
              | Poloxamers use Poloxamer | 
              | Polvidone use Povidone | 
              | Poly A | 
              | Poly A Polymerase use Polynucleotide Adenylyltransferase | 
              | Poly A-Binding Protein use Poly(A)-Binding Proteins | 
              | Poly A-U | 
              | Poly Adenosine Diphosphate Ribose | 
              | Poly ADP Ribose use Poly Adenosine Diphosphate Ribose | 
              | Poly ADP Ribose Polymerase use Poly(ADP-ribose) Polymerases | 
              | Poly C | 
              | Poly dA-dT | 
              | Poly dT use Poly T | 
              | Poly G | 
              | Poly I | 
              | Poly I-C | 
              | Poly T | 
              | Poly U | 
              | Poly(A) Tail use RNA, Messenger | 
              | Poly(A)+ mRNA use RNA, Messenger | 
              | Poly(A)+ RNA use RNA, Messenger | 
              | Poly(A)-Binding Protein I | 
              | Poly(A)-Binding Protein II | 
              | Poly(A)-Binding Proteins | 
              | Poly(ADP-ribose) Polymerase use Poly(ADP-ribose) Polymerases | 
              | Poly(ADP-ribose) Polymerases | 
              | Poly(ADP-Ribose) Synthase use Poly(ADP-ribose) Polymerases | 
              | Poly(Deoxyadenylate-Thymidylate) use Poly dA-dT | 
              | Poly(Lactide-Co-Glycoside) use Polyglactin 910 | 
              | Poly-Hema use Polyhydroxyethyl Methacrylate | 
              | Polyacetylene use Polyacetylenes | 
              | Polyacetylenes | 
              | Polyacid-Modified Composite Resins use Compomers | 
              | Polyacrylamide Gel Electrophoresis use Electrophoresis, Polyacrylamide Gel | 
              | Polyacrylamide Gel Electrophoresis, Two-Dimensional use Electrophoresis, Gel, Two-Dimensional | 
              | Polyadenylate Polymerase use Polynucleotide Adenylyltransferase | 
              | Polyadenylate Synthetase use Polynucleotide Adenylyltransferase | 
              | Polyadenylation | 
              | Polyadenylation Factors use mRNA Cleavage and Polyadenylation Factors | 
              | Polyadenylic Acids use Poly A | 
              | Polyadenylic-Polyuridylic Acid use Poly A-U | 
              | Polyalkenoate Cements use Glass Ionomer Cements | 
              | Polyalthia | 
              | Polyamides use Nylons | 
              | Polyamines | 
              | Polyamines, Biogenic use Biogenic Polyamines | 
              | Polyanethol Sulfonate use Polyanetholesulfonate | 
              | Polyanetholesulfonate | 
              | Polyangiaceae use Myxococcales | 
              | Polyangium use Myxococcales | 
              | Polyanhydrides | 
              | Polyarteritis Nodosa | 
              | Polyarthralgia use Arthralgia | 
              | Polyarthritis use Arthritis | 
              | Polyaziridine use Polyethyleneimine | 
              | Polybrominated Biphenyls | 
              | Polybromobiphenyl Compounds use Polybrominated Biphenyls | 
              | Polycarboxylate Cement | 
              | Polychaeta | 
              | Polychemotherapy use Drug Therapy, Combination | 
              | Polychlorinated Biphenyls | 
              | Polychlorobiphenyl Compounds use Polychlorinated Biphenyls | 
              | Polychloroethylene use Polyvinyl Chloride | 
              | Polychloroprene use Neoprene | 
              | Polychloroterphenyl Compounds | 
              | Polychlorotriphenyl Compounds use Polychloroterphenyl Compounds | 
              | Polychondritis, Chronic Atrophic use Polychondritis, Relapsing | 
              | Polychondritis, Relapsing | 
              | Polychrest Remedies use Polychrests | 
              | Polychrests | 
              | Polyclinic use Health Centers | 
              | Polycomb Repressive Complex 1 | 
              | Polycomb Repressive Complex 2 | 
              | Polycomb-Group Proteins | 
              | Polycrests use Polychrests | 
              | Polycyclic Aromatic Hydrocarbons use Polycyclic Hydrocarbons, Aromatic | 
              | Polycyclic Compounds | 
              | Polycyclic Hydrocarbons use Polycyclic Compounds | 
              | Polycyclic Hydrocarbons, Aromatic | 
              | Polycystic Kidney Disease, Infantile, Type I use Polycystic Kidney, Autosomal Recessive | 
              | Polycystic Kidney Diseases | 
              | Polycystic Kidney, Autosomal Dominant | 
              | Polycystic Kidney, Autosomal Recessive | 
              | Polycystic Ovary Syndrome | 
              | Polycythemia | 
              | Polycythemia Rubra Vera use Polycythemia Vera | 
              | Polycythemia Vera | 
              | Polycytidylic Acids use Poly C | 
              | Polydactyly | 
              | Polydeoxyadenine Nucleotides-Polythymine Nucleotides use Poly dA-dT | 
              | Polydeoxyribonucleotide Ligases use DNA Ligases | 
              | Polydeoxyribonucleotide Synthetases use DNA Ligases | 
              | Polydeoxyribonucleotides | 
              | Polydimethylsiloxanes use Dimethylpolysiloxanes | 
              | Polydioxanone | 
              | Polydipsia | 
              | Polydipsia, Psychogenic | 
              | Polydnaviridae | 
              | Polydystrophic Dwarfism use Mucopolysaccharidosis VI | 
              | Polydystrophic Oligophrenia use Mucopolysaccharidosis III | 
              | Polyelectrolytes use Polymers | 
              | Polyendocrinopathies, Autoimmune | 
              | Polyenes | 
              | Polyesters | 
              | Polyethylene | 
              | Polyethylene Glycol Cetyl Ether use Cetomacrogol | 
              | Polyethylene Glycols | 
              | Polyethylene Pipes | 
              | Polyethylene Terephthalates | 
              | Polyethyleneimine | 
              | Polyethylenes | 
              | Polygala | 
              | Polygala senega use Senega | 
              | Polygala virginiana use Senega | 
              | Polygalaceae | 
              | Polygalactoses use Galactans | 
              | Polygalacturonase | 
              | Polygeline | 
              | Polygenic Inheritance use Multifactorial Inheritance | 
              | Polygenic Traits use Multifactorial Inheritance | 
              | Polyglactin 910 | 
              | Polyglandular Type I Autoimmune Syndrome use Polyendocrinopathies, Autoimmune | 
              | Polyglandular Type II Autoimmune Syndrome use Polyendocrinopathies, Autoimmune | 
              | Polyglucoses use Glucans | 
              | Polyglutamate Folates use Pteroylpolyglutamic Acids | 
              | Polyglutamic Acid | 
              | Polyglycol Methacrylate use Polyhydroxyethyl Methacrylate | 
              | Polyglycolic Acid | 
              | Polyglycolide use Polyglycolic Acid | 
              | Polygonaceae | 
              | Polygonatum | 
              | Polygonum | 
              | Polygonum aviculare | 
              | Polygonum cuspidatum | 
              | Polygonum hydropiperoides | 
              | Polygonum maritimum | 
              | Polygonum meissnerianum use Polygonum sagittatum | 
              | Polygonum persicaria | 
              | Polygonum sagittatum | 
              | Polyguanylic Acids use Poly G | 
              | Polyhydramnios | 
              | Polyhydroxyalkanoates | 
              | Polyhydroxyethyl Methacrylate | 
              | Polyinosinic Acids use Poly I | 
              | Polyisocyanates use Polyurethanes | 
              | Polyisoprenyl Phosphate Monosaccharides | 
              | Polyisoprenyl Phosphate Oligosaccharides | 
              | Polyisoprenyl Phosphate Sugars | 
              | Polyisoprenyl Phosphates | 
              | Polykaryocytes use Giant Cells | 
              | Polyketide Synthases | 
              | Polyketides | 
              | Polylysine | 
              | Polymenophorea | 
              | Polymenorrhea use Menstruation Disturbances | 
              | Polymerase Chain Reaction | 
              | Polymerase Chain Reaction, Reverse Transcriptase use Reverse Transcriptase Polymerase Chain Reaction | 
              | Polymeric Immunoglobulin Receptors use Receptors, Polymeric Immunoglobulin | 
              | Polymerization | 
              | Polymers | 
              | Polymethacrylic Acids | 
              | Polymethyl Methacrylate | 
              | Polymethylmethacrylate use Polymethyl Methacrylate | 
              | Polymicrogyria | 
              | Polymnia uvedalia | 
              | Polymorphic Epithelial Mucin use Mucin-1 | 
              | Polymorphic Reticulosis use Granuloma, Lethal Midline | 
              | Polymorphism (Genetics) use Polymorphism, Genetic | 
              | Polymorphism, Crystallization use Crystallization | 
              | Polymorphism, Genetic | 
              | Polymorphism, Restriction Fragment Length | 
              | Polymorphism, Single Nucleotide | 
              | Polymorphism, Single-Stranded Conformational | 
              | Polymorphonuclear Leukocyte Elastase use Leukocyte Elastase | 
              | Polymorphonuclear Leukocytes use Neutrophils | 
              | Polymyalgia Rheumatica | 
              | Polymyoclonus use Myoclonus | 
              | Polymyositis | 
              | Polymyositis-Dermatomyositis use Dermatomyositis | 
              | Polymyxa use Plasmodiophorida | 
              | Polymyxin use Polymyxins | 
              | Polymyxin B | 
              | Polymyxin E use Colistin | 
              | Polymyxins | 
              | Polynesia | 
              | Polyneuritis use Neuritis | 
              | Polyneuropathies | 
              | Polyneuropathy, Acquired use Polyneuropathies | 
              | Polyneuropathy, Alcoholic use Alcoholic Neuropathy | 
              | Polyneuropathy, Paraneoplastic use Paraneoplastic Polyneuropathy | 
              | Polynuclear Aromatic Hydrocarbons use Polycyclic Hydrocarbons, Aromatic | 
              | Polynucleotide 5'-Hydroxyl-Kinase | 
              | Polynucleotide Adenylyltransferase | 
              | Polynucleotide Hydroxylkinase use Polynucleotide 5'-Hydroxyl-Kinase | 
              | Polynucleotide Kinase use Polynucleotide 5'-Hydroxyl-Kinase | 
              | Polynucleotide Ligases | 
              | Polynucleotide Phosphorylase use Polyribonucleotide Nucleotidyltransferase | 
              | Polynucleotide Synthetases use Polynucleotide Ligases | 
              | Polynucleotide Vaccines use Vaccines, DNA | 
              | Polynucleotides | 
              | Polyomaviridae | 
              | Polyomavirus | 
              | Polyomavirus Infections | 
              | Polyomavirus Large T Antigens use Antigens, Polyomavirus Transforming | 
              | Polyomavirus Middle T Antigens use Antigens, Polyomavirus Transforming | 
              | Polyomavirus Small T Antigens use Antigens, Polyomavirus Transforming | 
              | Polyomavirus T Proteins use Antigens, Polyomavirus Transforming | 
              | Polyomavirus Transforming Antigens use Antigens, Polyomavirus Transforming | 
              | Polyomavirus Tumor Antigens use Antigens, Polyomavirus Transforming | 
              | Polyomavirus, BK use BK Virus | 
              | Polyomavirus, JC use JC Virus | 
              | Polyopsia use Diplopia | 
              | Polyoxyethylene Polyoxypropylene Polyoxyethylene Polymer use Poloxalene | 
              | Polyoxyethylenes use Polyethylene Glycols | 
              | Polypentose Sulfate use Pentosan Sulfuric Polyester | 
              | Polypeptide Hormones use Peptide Hormones | 
              | Polypeptides use Peptides | 
              | Polyphagidae use Cockroaches | 
              | Polypharmacology | 
              | Polypharmacy | 
              | Polyphenols | 
              | Polyphloretin Phosphate | 
              | Polyphosphates | 
              | Polyphosphoinositides use Phosphatidylinositol Phosphates | 
              | Polyplacophora | 
              | Polyplax use Anoplura | 
              | Polyploidy | 
              | Polypodiaceae | 
              | Polypodium | 
              | Polypodium filix-mas use Filix-mas | 
              | Polyporaceae | 
              | Polyporales | 
              | Polyporus | 
              | Polyporus officinalis use Boletus laricis | 
              | Polyporus pinicola | 
              | Polyposis Coli, Familial use Adenomatous Polyposis Coli | 
              | Polyposis Syndrome, Familial use Adenomatous Polyposis Coli | 
              | Polypropylenes | 
              | Polyproteins | 
              | Polyps | 
              | Polypyrimidine Tract-Binding Protein | 
              | Polyradiculitis use Polyradiculopathy | 
              | Polyradiculoneuritis use Polyradiculoneuropathy | 
              | Polyradiculoneuropathy | 
              | Polyradiculoneuropathy, Acute Inflammatory use Guillain-Barre Syndrome | 
              | Polyradiculoneuropathy, Chronic Inflammatory Demyelinating | 
              | Polyradiculopathy | 
              | Polyradiculopathy, Abdominal use Polyradiculopathy | 
              | Polyribonucleotide Nucleotidyltransferase | 
              | Polyribonucleotide Synthetase use RNA Ligase (ATP) | 
              | Polyribonucleotides | 
              | Polyribosomes | 
              | Polyrotaxanes use Rotaxanes | 
              | Polysaccharide-Lyases | 
              | Polysaccharides | 
              | Polysaccharides, Bacterial | 
              | Polysomes use Polyribosomes | 
              | Polysomnography | 
              | Polysorbate 20 use Polysorbates | 
              | Polysorbate 80 use Polysorbates | 
              | Polysorbates | 
              | Polystichum | 
              | Polystyrenes | 
              | Polysyndactyly use Syndactyly | 
              | Polytef use Polytetrafluoroethylene | 
              | Polytene Chromosome use Polytene Chromosomes | 
              | Polytene Chromosomes | 
              | Polytetrafluoroethylene | 
              | Polythene use Polyethylene | 
              | Polythiazide | 
              | Polythymidylic Acids use Poly T | 
              | Polytrichum juniperinum | 
              | Polyubiquitin | 
              | Polyunsaturated Alkamides | 
              | Polyunsaturated Alkylamides use Polyunsaturated Alkamides | 
              | Polyunsaturated Isobutylamides use Polyunsaturated Alkamides | 
              | Polyurethanes | 
              | Polyuria | 
              | Polyuridylic Acids use Poly U | 
              | Polyvidon use Povidone | 
              | Polyvinyl Alcohol | 
              | Polyvinyl Chloride | 
              | Polyvinylpyridine N-Oxide | 
              | Polyvinylpyrrolidone use Povidone | 
              | Polyvinylpyrrolidone Iodine use Povidone-Iodine | 
              | Polyvinyls | 
              | Polyynes use Polyacetylenes | 
              | POMC use Pro-Opiomelanocortin | 
              | Pomegranate use Punicaceae | 
              | Pomelo Tree use Citrus | 
              | Pompe Disease use Glycogen Storage Disease Type II | 
              | Pompholyx use Eczema, Dyshidrotic | 
              | Poncirus | 
              | Pond Lily, Yellow use Nuphar | 
              | Ponderosa Pine use Pinus ponderosa | 
              | Ponds | 
              | Pongamia | 
              | Pongo | 
              | Pongo abelii | 
              | Pongo pygmaeus | 
              | Pons | 
              | Ponsinomycin use Miocamycin | 
              | Pontederia use Pontederiaceae | 
              | Pontederiaceae | 
              | Pontic use Denture, Partial, Fixed | 
              | Pontine Hemorrhage, Traumatic use Brain Stem Hemorrhage, Traumatic | 
              | Pontine Neoplasms use Brain Stem Neoplasms | 
              | Pontine Tegmentum | 
              | Pontoporia blainvillei use Dolphins | 
              | PONV use Postoperative Nausea and Vomiting | 
              | Poorhouses use Almshouses | 
              | Poorman's Barometer use Anagallis arvensis | 
              | Pop (Soft Drink) use Soft Drinks | 
              | Poplar, Balsam use Populus | 
              | Poplar, Black use Populus | 
              | Poplar, True use Populus | 
              | Poplar, Yellow use Liriodendron | 
              | Popliteal Artery | 
              | Popliteal Cyst | 
              | Popliteal Vein | 
              | Poppy use Papaver | 
              | Poppy, California use Eschscholzia | 
              | Poppy, Prickly use Argemone | 
              | Popsicle use Ice-cold Foods | 
              | Popular Works | 
              | Population | 
              | Population at Risk | 
              | Population Characteristics | 
              | Population Concentration | 
              | Population Control | 
              | Population Control Policies use Population Policy | 
              | Population Density | 
              | Population Distribution use Demography | 
              | Population Dynamics | 
              | Population Education | 
              | Population Estimates | 
              | Population Explosion use Population Growth | 
              | Population Explosion (Disasters) | 
              | Population Groups | 
              | Population Growth | 
              | Population not Economically Active use Inactive Population | 
              | Population Policy | 
              | Population Pressure | 
              | Population Projections | 
              | Population Size use Population Density | 
              | Population Statistics use Demographic Data | 
              | Population Studies in Public Health | 
              | Population Surveillance | 
              | Population Surveys | 
              | Population-Based Planning use Community Health Planning | 
              | Populus | 
              | Populus balsamifera use Populus candicans | 
              | Populus candicans | 
              | Populus tremuloides | 
              | Porcelain use Dental Porcelain | 
              | Porcelain-Metal Alloys use Metal Ceramic Alloys | 
              | Porcelia use Annonaceae | 
              | Porcine Adenoviruses use Adenoviruses, Porcine | 
              | Porcine circovirus use Circovirus | 
              | Porcine Enteroviruses use Enteroviruses, Porcine | 
              | Porcine Epidemic Abortion and Respiratory Syndrome use Porcine Reproductive and Respiratory Syndrome | 
              | Porcine epidemic diarrhea virus | 
              | Porcine Gastroenteritis, Transmissible use Gastroenteritis, Transmissible, of Swine | 
              | Porcine hemagglutinating encephalomyelitis virus use Coronavirus | 
              | Porcine parvovirus use Parvovirus, Porcine | 
              | Porcine Postweaning Multisystemic Wasting Syndrome | 
              | Porcine Reproductive and Respiratory Syndrome | 
              | Porcine respiratory and reproductive syndrome virus | 
              | Porcine Respiratory Coronavirus | 
              | Porcine torovirus use Torovirus | 
              | Porcine Transmissible Gastroenteritis Virus use Transmissible gastroenteritis virus | 
              | Porcine Xenograft Bioprosthesis use Bioprosthesis | 
              | Porcine Xenograft Dressings use Biological Dressings | 
              | Porcupines | 
              | Pore Forming Cytotoxic Proteins | 
              | Pore Proteins use Porins | 
              | Porencephaly | 
              | Porfimer use Dihematoporphyrin Ether | 
              | Porfiromycin | 
              | Porgies use Perciformes | 
              | Poria | 
              | Porichthys use Batrachoidiformes | 
              | Porifera | 
              | Porins | 
              | Pornography use Erotica | 
              | Porokeratosis | 
              | Porokeratosis of Mibelli use Porokeratosis | 
              | Porokeratosis Palmaris et Plantaris Disseminata use Porokeratosis | 
              | Porokeratosis, Disseminated Superficial Actinic use Porokeratosis | 
              | Porokeratosis, Linear use Porokeratosis | 
              | Porokeratosis, Mibelli use Porokeratosis | 
              | Porokeratosis, Palmoplantar use Porokeratosis | 
              | Porokeratosis, Punctate use Porokeratosis | 
              | Poroma | 
              | Poroporo use Solanum | 
              | Porosity | 
              | Porous Media Flocculators | 
              | PORP use Ossicular Prosthesis | 
              | Porphobilinogen | 
              | Porphobilinogen Ammonia-Lyase use Hydroxymethylbilane Synthase | 
              | Porphobilinogen Deaminase use Hydroxymethylbilane Synthase | 
              | Porphobilinogen Synthase | 
              | Porphyra | 
              | Porphyria Cutanea Tarda | 
              | Porphyria, Acute Intermittent | 
              | Porphyria, Erythrohepatic use Porphyria, Hepatoerythropoietic | 
              | Porphyria, Erythropoietic | 
              | Porphyria, Erythropoietic, Congenital use Porphyria, Erythropoietic | 
              | Porphyria, Hepatoerythropoietic | 
              | Porphyria, Variegate | 
              | Porphyrias | 
              | Porphyrias, Hepatic | 
              | Porphyridium | 
              | Porphyrin-Metal Chelatase use Ferrochelatase | 
              | Porphyrinogens | 
              | Porphyrins | 
              | Porphyromonas | 
              | Porphyromonas endodontalis | 
              | Porphyromonas gingivalis | 
              | Porpoises | 
              | Port Orford Cedar use Cupressus lawsoniana | 
              | Port Orford Cypress use Cupressus lawsoniana | 
              | Port Orford White Cedar use Cupressus lawsoniana | 
              | Port-Wine Stain | 
              | Portacaval Shunt, Surgical | 
              | Portal Pressure | 
              | Portal System | 
              | Portal Vein | 
              | Portals for Scientific Journals | 
              | Portasystemic Shunt, Surgical | 
              | Portasystemic Shunt, Transjugular Intrahepatic | 
              | Portion Size | 
              | Portoenterostomy, Hepatic | 
              | Portography | 
              | Portosystemic Encephalopathy use Hepatic Encephalopathy | 
              | Portosystemic Shunt, Surgical use Portasystemic Shunt, Surgical | 
              | Portosystemic Shunt, Transjugular Intrahepatic use Portasystemic Shunt, Transjugular Intrahepatic | 
              | Portraits | 
              | Portraits as Topic | 
              | Portugal | 
              | Portuguese Guinea use Guinea-Bissau | 
              | Portuguese Man-of-War use Hydrozoa | 
              | Portulaca | 
              | Portulacaceae | 
              | Posidonia use Alismatidae | 
              | Position Description use Job Description | 
              | Position Sense use Proprioception | 
              | Position-Specific Scoring Matrices | 
              | Position-Specific Weight Matrices use Position-Specific Scoring Matrices | 
              | Positive Displacement Pumps | 
              | Positive End-Expiratory Pressure use Positive-Pressure Respiration | 
              | Positive Reinforcement use Reinforcement (Psychology) | 
              | Positive Transcriptional Elongation Factor B | 
              | Positive-Pressure Respiration | 
              | Positive-Pressure Respiration, Intrinsic | 
              | Positive-Pressure Respiration, Occult use Positive-Pressure Respiration, Intrinsic | 
              | Positron-Emission Tomography | 
              | Positrons use Electrons | 
              | Posology | 
              | Possums, Brush-Tailed use Trichosurus | 
              | Post and Core Technique | 
              | Post Disaster Reconstruction use Reconstruction | 
              | Post Disaster Resettlement | 
              | Post-2015 Development Goals use Sustainable Development Goals | 
              | Post-Anesthesia Nursing use Postanesthesia Nursing | 
              | Post-Basic Nursing Education use Education, Nursing, Continuing | 
              | Post-Concussion Syndrome | 
              | Post-Concussive Syndrome use Post-Concussion Syndrome | 
              | Post-Dural Puncture Headache | 
              | Post-Exercise Hypotension | 
              | Post-Exposure Prophylaxis | 
              | Post-Ictal Memory Loss use Amnesia, Anterograde | 
              | Post-Infarction Heart Rupture use Heart Rupture, Post-Infarction | 
              | Post-Neonatal Mortality use Infant Mortality | 
              | Post-operative Vasoplegic Syndrome use Vasoplegia | 
              | Post-Polio Syndrome use Postpoliomyelitis Syndrome | 
              | Post-Poliomyelitis Syndrome use Postpoliomyelitis Syndrome | 
              | Post-Registration Nursing Education use Education, Nursing, Continuing | 
              | Post-Surgical Nursing use Postanesthesia Nursing | 
              | Post-Synaptic Density | 
              | Post-Transcriptional Gene Silencing use RNA Interference | 
              | Post-Transcriptional RNA Modification use RNA Processing, Post-Transcriptional | 
              | Post-Translational Isoprenylation use Protein Prenylation | 
              | Post-Translational Protein Modification use Protein Processing, Post-Translational | 
              | Post-Traumatic Cancer use Neoplasms, Post-Traumatic | 
              | Post-Traumatic Headache | 
              | Post-Traumatic Hydrocephalus use Hydrocephalus | 
              | Post-Traumatic Neoplasms use Neoplasms, Post-Traumatic | 
              | Post-Traumatic Stress Disorders use Stress Disorders, Post-Traumatic | 
              | Post-Traumatic Tic Disorder use Tic Disorders | 
              | Post-Traumatic Vegetative State use Persistent Vegetative State | 
              | Post-Vaccinal Encephalomyelitis use Encephalomyelitis, Acute Disseminated | 
              | Postage Stamps use Philately | 
              | Postal Service | 
              | Postanesthesia Nursing | 
              | Postcards | 
              | Postcholecystectomy Syndrome | 
              | Postcholedochoduodenostomy Syndrome use Postcholecystectomy Syndrome | 
              | Postcholedochojejunostomy Syndrome use Postcholecystectomy Syndrome | 
              | Postcholedochostomy Syndrome use Postcholecystectomy Syndrome | 
              | Postcibal Period use Postprandial Period | 
              | Postcoital Contraceptives use Contraceptives, Postcoital | 
              | Postcommissurotomy Syndrome use Postpericardiotomy Syndrome | 
              | Postencephalitic Parkinsonism use Parkinson Disease, Postencephalitic | 
              | Posterior Capsular Rupture, Ocular | 
              | Posterior Capsule of the Lens | 
              | Posterior Capsule, Lens use Posterior Capsule of the Lens | 
              | Posterior Capsulotomy | 
              | Posterior Cerebellar Commissure | 
              | Posterior Cerebral Artery | 
              | Posterior Cerebral Artery Infarction use Infarction, Posterior Cerebral Artery | 
              | Posterior Cervical Sympathetic Syndrome | 
              | Posterior Choroidal Artery Infarction use Cerebral Infarction | 
              | Posterior Cruciate Ligament | 
              | Posterior Eye Segment | 
              | Posterior Fossa Neoplasms use Infratentorial Neoplasms | 
              | Posterior Horn Cells | 
              | Posterior Hypothalamic Region use Hypothalamus, Posterior | 
              | Posterior Inferior Cerebellar Artery Syndrome use Lateral Medullary Syndrome | 
              | Posterior Ischemic Optic Neuropathy use Optic Neuropathy, Ischemic | 
              | Posterior Leukoencephalopathy Syndrome | 
              | Posterior Longitudinal Ligament use Longitudinal Ligaments | 
              | Posterior Nucleus of Thalamus use Posterior Thalamic Nuclei | 
              | Posterior Spinal Artery Syndrome use Spinal Cord Vascular Diseases | 
              | Posterior Thalamic Nuclei | 
              | Posterior Tibial Nerve use Tibial Nerve | 
              | Posterior Tibial Neuropathy use Tibial Neuropathy | 
              | Posterior Tibial Tendon Dysfunction | 
              | Posterior Vitreous Detachment use Vitreous Detachment | 
              | Posters | 
              | Posters as Topic | 
              | Postgastrectomy Syndromes | 
              | Postgraduate Nursing Education use Education, Nursing, Graduate | 
              | Posthumous Conception | 
              | Posthumous Reproduction use Posthumous Conception | 
              | Postimplantation Embryo Development use Embryonic Development | 
              | Postinfectious Encephalomyelitis use Encephalomyelitis, Acute Disseminated | 
              | Postmarketing Product Surveillance use Product Surveillance, Postmarketing | 
              | Postmenopausal Bone Loss use Osteoporosis, Postmenopausal | 
              | Postmenopausal Hormone Replacement Therapy use Estrogen Replacement Therapy | 
              | Postmenopausal Osteoporosis use Osteoporosis, Postmenopausal | 
              | Postmenopause | 
              | Postmodernism | 
              | Postmortem Changes | 
              | Postnatal Care | 
              | Postnatal Depression use Depression, Postpartum | 
              | Postneonatal Mortality use Infant Mortality | 
              | Postoperative Care | 
              | Postoperative Complications | 
              | Postoperative Hemorrhage | 
              | Postoperative Nausea and Vomiting | 
              | Postoperative Period | 
              | Postoperative Vasoplegic Syndrome use Vasoplegia | 
              | Postoperative Wound Infection use Surgical Wound Infection | 
              | Postovulatory Phase use Luteal Phase | 
              | Postpartum Depression use Depression, Postpartum | 
              | Postpartum Hemorrhage | 
              | Postpartum Period | 
              | Postpartum Thyroiditis | 
              | Postpericardiotomy Syndrome | 
              | Postphlebitic Disease use Postphlebitic Syndrome | 
              | Postphlebitic Syndrome | 
              | Postphlebitic Ulcer use Postphlebitic Syndrome | 
              | Postpoliomyelitis Muscular Atrophy use Postpoliomyelitis Syndrome | 
              | Postpoliomyelitis Syndrome | 
              | Postprandial Hyperglycemia use Hyperglycemia | 
              | Postprandial Period | 
              | Postsynaptic Potential Summation | 
              | Postthrombotic Syndrome | 
              | Postural Balance | 
              | Postural Drainage use Drainage, Postural | 
              | Postural Drainage, Pulmonary use Drainage, Postural | 
              | Postural Orthostatic Tachycardia Syndrome | 
              | Postural Tachycardia Syndrome use Postural Orthostatic Tachycardia Syndrome | 
              | Posture | 
              | Postviral Fatigue Syndrome use Fatigue Syndrome, Chronic | 
              | Postweaning Multisystemic Wasting Syndrome, Porcine use Porcine Postweaning Multisystemic Wasting Syndrome | 
              | Postzoster Arteritis use Vasculitis, Central Nervous System | 
              | Pot-Marigold use Calendula officinalis (Homeopathy) | 
              | Potable Water use Drinking Water | 
              | Potamobius astacus use Astacus fluviatilis | 
              | Potamogeton use Potamogetonaceae | 
              | Potamogeton natans | 
              | Potamogetonaceae | 
              | Potassium | 
              | Potassium Acetate | 
              | Potassium Antimonyltartrate use Antimony Potassium Tartrate | 
              | Potassium Bichromate use Potassium Dichromate | 
              | Potassium Bioxalate use Kali Bioxalicum | 
              | Potassium Bitartrate use Kali Bitartaricum | 
              | Potassium Canrenoate use Canrenoic Acid | 
              | Potassium Channel Blockers | 
              | Potassium Channel Interacting Proteins use Kv Channel-Interacting Proteins | 
              | Potassium Channels | 
              | Potassium Channels, Background use Potassium Channels, Tandem Pore Domain | 
              | Potassium Channels, Baseline use Potassium Channels, Tandem Pore Domain | 
              | Potassium Channels, Calcium-Activated | 
              | Potassium Channels, Intermediate-Conductance Calcium-Activated use Intermediate-Conductance Calcium-Activated Potassium Channels | 
              | Potassium Channels, Inwardly Rectifying | 
              | Potassium Channels, Leak use Potassium Channels, Tandem Pore Domain | 
              | Potassium Channels, Tandem Pore Domain | 
              | Potassium Channels, Voltage-Gated | 
              | Potassium Chloride | 
              | Potassium Chlorite use Kali Chlorosum | 
              | Potassium Chromate use Kali Chromicum | 
              | Potassium Citrate | 
              | Potassium Clavulanate-Amoxicillin Combination use Amoxicillin-Potassium Clavulanate Combination | 
              | Potassium Compounds | 
              | Potassium Cyanide | 
              | Potassium Deficiency | 
              | Potassium Dichromate | 
              | Potassium Glutamate use Glutamic Acid | 
              | Potassium Iodide | 
              | Potassium Ionophores | 
              | Potassium Isotopes | 
              | Potassium Magnesium Asparaginate use Potassium Magnesium Aspartate | 
              | Potassium Magnesium Aspartate | 
              | Potassium Monoacid Phosphate use Kali Phosphoricum | 
              | Potassium Permanganate | 
              | Potassium Phosphate, Dibasic use Kali Phosphoricum | 
              | Potassium Pump use Sodium-Potassium-Exchanging ATPase | 
              | Potassium Radioisotopes | 
              | Potassium Sparing Diuretics use Diuretics, Potassium Sparing | 
              | Potassium Succinate use Succinic Acid | 
              | Potassium, Dietary | 
              | Potassium-Hydrogen Antiporters | 
              | Potato Fecula use Starch and Fecula | 
              | Potato virus X use Potexvirus | 
              | Potato Virus Y use Potyvirus | 
              | Potatoes use Solanum tuberosum | 
              | Potency | 
              | Potency Similitude use Simillimum Potency | 
              | Potency Tracking use Simillimum Potency | 
              | Potency, High use High Potencies | 
              | Potency, Low use Low Potencies | 
              | Potential for Purification use Analysis of Treatability | 
              | Potential Injury Creating Events use Disasters | 
              | Potential Years of Life Lost | 
              | Potentila use Potentilla tormentilla | 
              | Potentilla | 
              | Potentilla anserina | 
              | Potentilla aurea | 
              | Potentilla erecta | 
              | Potentilla reptans | 
              | Potentilla tormentilla | 
              | Potentiometry | 
              | Potexvirus | 
              | Pothos foetidus | 
              | Potoroidae | 
              | Pott Disease use Tuberculosis, Spinal | 
              | Pott Puffy Tumor | 
              | Pott's Disease use Tuberculosis, Spinal | 
              | Pottos use Lorisidae | 
              | Potyviridae | 
              | Potyvirus | 
              | POU Domain Factors | 
              | Pou4f1 Transcription Factor use Transcription Factor Brn-3A | 
              | Pou4f2 Transcription Factor use Transcription Factor Brn-3B | 
              | Pou4f3 Transcription Factor use Transcription Factor Brn-3C | 
              | Pouchitis | 
              | Poult Enteritis Mortality Syndrome | 
              | Poultry | 
              | Poultry Diseases | 
              | Poultry Farms use Poultry | 
              | Poultry Products | 
              | Poultry Raising use Poultry | 
              | Pour Plate Count use Colony Count, Microbial | 
              | Pouteria | 
              | Poverty | 
              | Poverty Areas | 
              | Povidone | 
              | Povidone-Iodine | 
              | Powassan Encephalitis use Encephalitis, Tick-Borne | 
              | Powassan virus use Encephalitis Viruses, Tick-Borne | 
              | Powder Diffraction | 
              | Powder for Body | 
              | Powder for Food Preparation | 
              | Powdered Milk use Breast-Milk Substitutes | 
              | Powders | 
              | Power (Psychology) | 
              | Power Plants | 
              | Power Provision use Energy Supply | 
              | Power Sources use Electric Power Supplies | 
              | Power Sources (Environmental Health) use Energy-Generating Resources | 
              | Power Sources, Bioelectric use Bioelectric Energy Sources | 
              | Power Suppliers use Power Plants | 
              | Power Supplies use Electric Power Supplies | 
              | Power Supply use Energy Supply | 
              | Power, Personal use Power (Psychology) | 
              | Power, Professional use Power (Psychology) | 
              | Power, Social use Power (Psychology) | 
              | Poxviridae | 
              | Poxviridae Infections | 
              | Poxvirus avium use Avipoxvirus | 
              | Poxvirus Infections use Poxviridae Infections | 
              | Poxvirus muris use Ectromelia virus | 
              | Poxvirus Myxomatis use Myxoma virus | 
              | Poxvirus officinale use Vaccinia virus | 
              | Poxvirus variolae use Variola virus | 
              | PP Cells, Pancreatic use Pancreatic Polypeptide-Secreting Cells | 
              | pp39(c-mos) use Proto-Oncogene Proteins c-mos | 
              | pp59(v-rel) use Oncogene Proteins v-rel | 
              | pp60(c-src) use Proto-Oncogene Proteins pp60(c-src) | 
              | pp60(v-src) use Oncogene Protein pp60(v-src) | 
              | PPAR alpha | 
              | PPAR delta | 
              | PPAR gamma | 
              | PPAR-beta | 
              | PPARalpha use PPAR alpha | 
              | PPARdelta use PPAR delta | 
              | PPARgamma use PPAR gamma | 
              | PPIase use Peptidylprolyl Isomerase | 
              | PPLO use Mycoplasma | 
              | PPP use Public-Private Sector Partnerships | 
              | PPRA use Program of Risk Prevention on Working Environment | 
              | PQQ Cofactor | 
              | Practice (Psychology) | 
              | Practice Guideline | 
              | Practice Guidelines as Topic | 
              | Practice Management | 
              | Practice Management Services use Practice Management | 
              | Practice Management, Dental | 
              | Practice Management, Medical | 
              | Practice Management, Veterinary | 
              | Practice Nurse use Nurse Practitioners | 
              | Practice Patterns, Dental use Dentist's Practice Patterns | 
              | Practice Patterns, Professional use Physician's Practice Patterns | 
              | Practice Valuation and Purchase | 
              | Practolol | 
              | PRAD1 Protein use Cyclin D1 | 
              | Prader-Willi Syndrome | 
              | Pragmatic Clinical Trial | 
              | Pragmatic Clinical Trials use Pragmatic Clinical Trials as Topic | 
              | Pragmatic Clinical Trials as Topic | 
              | Prairie use Grassland | 
              | Prairie Dogs use Sciuridae | 
              | Prajmaline | 
              | Prajmalium use Prajmaline | 
              | Pralidoxime Compounds | 
              | Praomys use Murinae | 
              | Praseodymium | 
              | Prasterone use Dehydroepiandrosterone | 
              | Prausnitz-Kustner Test use Intradermal Tests | 
              | Pravastatin | 
              | Prayer use Religion | 
              | Prayer Healing use Faith Healing | 
              | Praying Mantis use Mantodea | 
              | Prazepam | 
              | Praziquantel | 
              | Prazosin | 
              | Pre-B Cell Receptors | 
              | Pre-B Lymphocytes use Precursor Cells, B-Lymphoid | 
              | Pre-B-Cell Colony-Enhancing Factor use Nicotinamide Phosphoribosyltransferase | 
              | Pre-B-Cell Leukemia use Precursor B-Cell Lymphoblastic Leukemia-Lymphoma | 
              | Pre-Eclampsia | 
              | Pre-Excitation Syndromes | 
              | Pre-Excitation, Mahaim-Type | 
              | Pre-Exposure Prophylaxis | 
              | Pre-Hospital Care use Prehospital Care | 
              | Pre-Hospital Services use Prehospital Services | 
              | Pre-Hypertension use Prehypertension | 
              | Pre-Ictal Memory Loss use Amnesia, Retrograde | 
              | Pre-Menopause use Premenopause | 
              | Pre-Warning use Prewarning | 
              | Prealbumin | 
              | Preanesthetic Medication | 
              | Prebeta-Lipoproteins use Lipoproteins, VLDL | 
              | Prebiotics | 
              | Precancerous Conditions | 
              | Precatory Bean use Abrus | 
              | Precatory Bean Plant use Abrus | 
              | Precaution | 
              | Precautions, Universal use Universal Precautions | 
              | Preceptorship | 
              | Precipitating Factors | 
              | Precipitation Gauge | 
              | Precipitation Intensity | 
              | Precipitation Types | 
              | Precipitin Tests | 
              | Precipitins | 
              | Precision Attachment, Denture use Denture Precision Attachment | 
              | Precocious Neonatal Mortality use Early Neonatal Mortality | 
              | Preconception Care | 
              | Preconception Injuries | 
              | Precursor B-Cell Lymphoblastic Leukemia-Lymphoma | 
              | Precursor B-Lymphocytes use Precursor Cells, B-Lymphoid | 
              | Precursor Cell Lymphoblastic Leukemia-Lymphoma | 
              | Precursor Cells, B-Lymphoid | 
              | Precursor Cells, T-Lymphoid | 
              | Precursor RNA use RNA Precursors | 
              | Precursor T-Cell Lymphoblastic Leukemia-Lymphoma | 
              | Predator Chain use Food Chain | 
              | Predatory Behavior | 
              | Predental Education use Education, Predental | 
              | Prediabetes use Prediabetic State | 
              | Prediabetic State | 
              | Predictive Value use Predictive Value of Tests | 
              | Predictive Value of Tests | 
              | Predisaster Mitigation use Prevention and Mitigation | 
              | Predisposing Factors use Causality | 
              | Prednacinolone use Desonide | 
              | Prednimustine | 
              | Prednisolone | 
              | Prednisone | 
              | Preening use Grooming | 
              | Preexisting Condition use Preexisting Condition Coverage | 
              | Preexisting Condition Coverage | 
              | Preferred Provider Organizations | 
              | Prefilters | 
              | Prefiltration | 
              | Prefrontal Cortex | 
              | Pregnadienediols | 
              | Pregnadienes | 
              | Pregnadienetriols | 
              | Pregnancy | 
              | Pregnancy Complications | 
              | Pregnancy Complications, Cardiovascular | 
              | Pregnancy Complications, Hematologic | 
              | Pregnancy Complications, Infectious | 
              | Pregnancy Complications, Neoplastic | 
              | Pregnancy Complications, Parasitic | 
              | Pregnancy in Adolescence | 
              | Pregnancy in Diabetics | 
              | Pregnancy in Phenylketonuria use Phenylketonuria, Maternal | 
              | Pregnancy Luteoma use Luteoma | 
              | Pregnancy Maintenance | 
              | Pregnancy Nutrition use Prenatal Nutritional Physiological Phenomena | 
              | Pregnancy Outcome | 
              | Pregnancy Proteins | 
              | Pregnancy Rate | 
              | Pregnancy Reduction, Multifetal | 
              | Pregnancy Tests | 
              | Pregnancy Tests, Immunologic | 
              | Pregnancy Trimester, First | 
              | Pregnancy Trimester, Second | 
              | Pregnancy Trimester, Third | 
              | Pregnancy Trimesters | 
              | Pregnancy, Abdominal | 
              | Pregnancy, Adolescent use Pregnancy in Adolescence | 
              | Pregnancy, Angular | 
              | Pregnancy, Animal | 
              | Pregnancy, Cornual | 
              | Pregnancy, Ectopic | 
              | Pregnancy, First Trimester use Pregnancy Trimester, First | 
              | Pregnancy, Heterotopic | 
              | Pregnancy, High-Risk | 
              | Pregnancy, Interstitial | 
              | Pregnancy, Molar use Hydatidiform Mole | 
              | Pregnancy, Multiple | 
              | Pregnancy, Ovarian | 
              | Pregnancy, Prolonged | 
              | Pregnancy, Quadruplet | 
              | Pregnancy, Quintuplet | 
              | Pregnancy, Second Trimester use Pregnancy Trimester, Second | 
              | Pregnancy, Teenage use Pregnancy in Adolescence | 
              | Pregnancy, Third Trimester use Pregnancy Trimester, Third | 
              | Pregnancy, Triplet | 
              | Pregnancy, Tubal | 
              | Pregnancy, Twin | 
              | Pregnancy, Unplanned | 
              | Pregnancy, Unwanted | 
              | Pregnancy-Associated alpha 2-Globulins use Pregnancy-Associated alpha 2-Macroglobulins | 
              | Pregnancy-Associated alpha 2-Glycoproteins use Pregnancy-Associated alpha 2-Macroglobulins | 
              | Pregnancy-Associated alpha 2-Macroglobulins | 
              | Pregnancy-Associated Plasma Protein-A | 
              | Pregnancy-Specific beta 1-Glycoprotein use Pregnancy-Specific beta 1-Glycoproteins | 
              | Pregnancy-Specific beta 1-Glycoproteins | 
              | Pregnanediol | 
              | Pregnanediones | 
              | Pregnanes | 
              | Pregnanetriol | 
              | Pregnanolone | 
              | Pregnant Mare Serum Gonadotropins use Gonadotropins, Equine | 
              | Pregnant Women | 
              | Pregnatrienes | 
              | Pregnenediones | 
              | Pregnenes | 
              | Pregneninolone use Ethisterone | 
              | Pregnenolone | 
              | Pregnenolone Carbonitrile | 
              | Prehistory use History, Ancient | 
              | Prehospital Care | 
              | Prehospital Emergency Care use Emergency Medical Services | 
              | Prehospital Services | 
              | Prehypertension | 
              | Preimplantation Diagnosis | 
              | Preimplantation Embryo Development use Embryonic Development | 
              | Preimplantation Genetic Diagnosis use Preimplantation Diagnosis | 
              | Prejudice | 
              | Prekallikrein | 
              | Preleukemia | 
              | Prelingual Deafness use Deafness | 
              | Premarital Examinations | 
              | Premature Aging use Aging, Premature | 
              | Premature Atrial Beats use Atrial Premature Complexes | 
              | Premature Atrial Contractions use Atrial Premature Complexes | 
              | Premature Beats use Cardiac Complexes, Premature | 
              | Premature Birth | 
              | Premature Cardiac Complexes use Cardiac Complexes, Premature | 
              | Premature Death use Mortality, Premature | 
              | Premature Ejaculation | 
              | Premature Mortality use Mortality, Premature | 
              | Premature Rupture of Membrane (Pregnancy) use Fetal Membranes, Premature Rupture | 
              | Premature Stop Codon use Codon, Nonsense | 
              | Premature Supraventricular Beats use Atrial Premature Complexes | 
              | Premature Ventricular Beats use Ventricular Premature Complexes | 
              | Premature Ventricular Contractions use Ventricular Premature Complexes | 
              | Premedical Education use Education, Premedical | 
              | Premedication | 
              | Premedication, Antibiotic use Antibiotic Prophylaxis | 
              | Premenopause | 
              | Premenstrual Dysphoric Disorder | 
              | Premenstrual Syndrome | 
              | Premenstrual Tension use Premenstrual Syndrome | 
              | Premolar use Bicuspid | 
              | Prenalterol | 
              | Prenanthes serpentaria use Nabalus serpentaria | 
              | Prenatal Care | 
              | Prenatal Diagnosis | 
              | Prenatal Diagnosis, Ultrasonic use Ultrasonography, Prenatal | 
              | Prenatal Education | 
              | Prenatal Exposure Delayed Effects | 
              | Prenatal Injuries | 
              | Prenatal Nutrition | 
              | Prenatal Nutrition Physiology use Prenatal Nutritional Physiological Phenomena | 
              | Prenatal Nutritional Physiological Phenomena | 
              | Prenatal Structures use Embryonic Structures | 
              | Prenazone use Feprazone | 
              | Preneoplastic Conditions use Precancerous Conditions | 
              | Prenylamine | 
              | Prenylation | 
              | Prenyltransferase use Dimethylallyltranstransferase | 
              | Preoperative Care | 
              | Preoperative Period | 
              | Preoptic Area | 
              | Preovulatory Phase use Follicular Phase | 
              | Prepaid Dental Care use Insurance, Dental | 
              | Prepaid Group Health Organizations use Health Maintenance Organizations | 
              | Prepaid Group Practice use Group Practice, Prepaid | 
              | Prepaid Health Plans | 
              | Preparation Scales | 
              | Prepared Foods | 
              | Prepared Mustard | 
              | Preparedness | 
              | Prephenate Dehydratase | 
              | Prephenate Dehydrogenase | 
              | Prephenate Hydro-lyase use Prephenate Dehydratase | 
              | Preprosthetic Oral Surgical Procedures use Oral Surgical Procedures, Preprosthetic | 
              | Prepuce use Foreskin | 
              | Prepulse Inhibition | 
              | Presbycusis | 
              | Presbyopia | 
              | Presbytis use Cercopithecidae | 
              | Preschool Education | 
              | Preschools use Schools, Nursery | 
              | Prescribed Drugs use Prescription Drugs | 
              | Prescription Drug Diversion | 
              | Prescription Drug Misuse | 
              | Prescription Drugs | 
              | Prescription Fees | 
              | Prescription Insurance use Insurance, Pharmaceutical Services | 
              | Prescriptions | 
              | Presenile Alzheimer Dementia use Alzheimer Disease | 
              | Presenilin-1 | 
              | Presenilin-2 | 
              | Presenilins | 
              | Presentation, Breech use Breech Presentation | 
              | Presentation, Fetal use Labor Presentation | 
              | Preservation, Biological | 
              | Preservation, Food use Food Preservation | 
              | Preservatives in Cosmetics use Additives in Cosmetics | 
              | Preservatives, Pharmaceutical | 
              | Press | 
              | Press Filters | 
              | Pressoreceptors | 
              | Pressure | 
              | Pressure Conduits use Pressure Waterpipe Networks | 
              | Pressure Filters | 
              | Pressure Reducing Valves | 
              | Pressure Regulators use Pressure Reducing Valves | 
              | Pressure Sore use Pressure Ulcer | 
              | Pressure Suits use Gravity Suits | 
              | Pressure Systems | 
              | Pressure Ulcer | 
              | Pressure Waterpipe Networks | 
              | Presumed Consent | 
              | Presynaptic Receptors use Receptors, Presynaptic | 
              | Presynaptic Terminals | 
              | Presyncope use Syncope | 
              | Pretectal Region | 
              | Preteen Pregnancy use Pregnancy in Adolescence | 
              | Preterm Labor use Obstetric Labor, Premature | 
              | Preternatural Human Combustibility use Spontaneous Combustion | 
              | Pretreatment | 
              | Prevalence | 
              | Prevalence Rate use Prevalence | 
              | Prevalence Ratio | 
              | Prevalence Studies use Cross-Sectional Studies | 
              | Prevention and Mitigation | 
              | Prevention of Communicable Diseases use Communicable Disease Prevention | 
              | Prevention, Primary use Primary Prevention | 
              | Preventive Care use Preventive Health Services | 
              | Preventive Dentistry | 
              | Preventive Health Services | 
              | Preventive Maintenance | 
              | Preventive Medicine | 
              | Preventive Psychiatry | 
              | Preventive Services use Preventive Health Services | 
              | Previous Analysis use Previous Analysis of Products | 
              | Previous Analysis for Product Registration use Previous Analysis of Products | 
              | Previous Analysis of Products | 
              | Prevotella | 
              | Prevotella intermedia | 
              | Prevotella melaninogenica | 
              | Prevotella nigrescens | 
              | Prevotella ruminicola | 
              | Prewarning | 
              | Prey use Hunt | 
              | Priapism | 
              | Price Lists | 
              | Prickly Datura use Datura metel | 
              | Prickly Poppy use Argemone | 
              | Prickly-pear Cactus use Opuntia | 
              | Pricklyburr use Datura metel | 
              | Prilocaine | 
              | Primaclone use Primidone | 
              | Primaquine | 
              | Primary Action use Primary Effect | 
              | Primary Amine Oxidoreductases use Oxidoreductases Acting on CH-NH2 Group Donors | 
              | Primary Care use Primary Health Care | 
              | Primary Care Nursing | 
              | Primary Care Physicians use Physicians, Primary Care | 
              | Primary Cell Culture | 
              | Primary CNS Vasculitis use Vasculitis, Central Nervous System | 
              | Primary Dysautonomias | 
              | Primary Education use Education, Primary and Secondary | 
              | Primary Effect | 
              | Primary Effluents | 
              | Primary Effusion Lymphoma use Lymphoma, Primary Effusion | 
              | Primary Environmental Care | 
              | Primary Environmental Health use Primary Environmental Care | 
              | Primary Environmental Health Care use Primary Environmental Care | 
              | Primary Graft Dysfunction | 
              | Primary Health Care | 
              | Primary Hypokalemic Periodic Paralysis use Hypokalemic Periodic Paralysis | 
              | Primary Impact | 
              | Primary Myelofibrosis | 
              | Primary Nursing | 
              | Primary Nursing Care use Primary Nursing | 
              | Primary Ovarian Insufficiency | 
              | Primary Parkinsonism use Parkinson Disease | 
              | Primary Prevention | 
              | Primary Progressive Nonfluent Aphasia | 
              | Primary RNA Transcript use RNA Precursors | 
              | Primary Sedimentation | 
              | Primary Tooth use Tooth, Deciduous | 
              | Primary Treatment | 
              | Primary Treatment Plants | 
              | Primary Wave use p Wave | 
              | Primase use DNA Primase | 
              | Primate Diseases | 
              | Primate Immunodeficiency Viruses use Lentiviruses, Primate | 
              | Primate T-lymphotropic virus 1 | 
              | Primate T-lymphotropic virus 2 | 
              | Primate T-lymphotropic virus 3 | 
              | Primates | 
              | Primed In Situ Labeling | 
              | Primidone | 
              | Primiparity use Parity | 
              | Primitive Gut use Gastrula | 
              | Primitive Streak | 
              | Primrose use Primula | 
              | Primrose, Evening use Oenothera biennis | 
              | Primula | 
              | Primula farinosa | 
              | Primula lactea use Androsace lactea | 
              | Primula obconica | 
              | Primula officinalis use Primula veris | 
              | Primula veris | 
              | Primulaceae | 
              | Prince Edward Island | 
              | Prince's Pine use Chimaphila maculata | 
              | Principal Component Analysis | 
              | Principle-Based Ethics | 
              | Prindolol use Pindolol | 
              | Prinos verticillatus | 
              | PRINS use Primed In Situ Labeling | 
              | Printed Circuit Boards | 
              | Printers' Marks | 
              | Printing | 
              | Printing Companies use Printing Industry | 
              | Printing Industry | 
              | Printing Workshops use Printing Industry | 
              | Printing, Three-Dimensional | 
              | Prinzmetal Angina use Angina Pectoris, Variant | 
              | Prion Diseases | 
              | Prion Proteins use Prions | 
              | Prions | 
              | Prionurus australis use Buthus australis | 
              | Priorities, Health use Health Priorities | 
              | Priority Groups use Health Priorities | 
              | Prison Sanitation | 
              | Prisoner of War | 
              | Prisoner's Dilemma use Game Theory | 
              | Prisoners | 
              | Prisoners of War | 
              | Prisons | 
              | Pristinamycin | 
              | Privacy | 
              | Privacy Act use Privacy | 
              | Privacy of Patient Data use Confidentiality | 
              | Privacy of Space use Personal Space | 
              | Private Enterprise use Private Sector | 
              | Private Health Care Coverage | 
              | Private Hospitals use Hospitals, Private | 
              | Private Management | 
              | Private Practice | 
              | Private Rooms use Patients' Rooms | 
              | Private Sector | 
              | Privatization | 
              | Privet use Ligustrum | 
              | Privileged Communication use Confidentiality | 
              | PRL-Secreting Pituitary Adenoma use Prolactinoma | 
              | PRO Professional Review Organizations use Professional Review Organizations | 
              | Pro-Apoptotic Proteins use Apoptosis Regulatory Proteins | 
              | Pro-Opiocortin use Pro-Opiomelanocortin | 
              | Pro-Opiomelanocortin | 
              | Pro-Opiomelanocortin Converting Enzyme use Proprotein Convertases | 
              | Proaccelerin use Factor V | 
              | Proactive Inhibition | 
              | Proadifen | 
              | Proalbumin use Prealbumin | 
              | Proanthocyanidins | 
              | Proazamine use Promethazine | 
              | Probabilistic Models use Models, Statistical | 
              | Probability | 
              | Probability Learning | 
              | Probability Theory | 
              | Probable Maximum Precipitation | 
              | Probable Precipitation | 
              | Probe | 
              | Probenecid | 
              | Probiotics | 
              | Problem Solving | 
              | Problem-Based Learning | 
              | Problem-Oriented Medical Records use Medical Records, Problem-Oriented | 
              | Problems and Exercises | 
              | Proboscidea Mammal | 
              | Proboscidea Plant use Pedaliaceae | 
              | Probucol | 
              | Procainamide | 
              | Procaine | 
              | Procaine Amide use Procainamide | 
              | Procambarus use Astacoidea | 
              | Procarbazine | 
              | Procaterol | 
              | Procedural Law | 
              | Process Assessment (Health Care) | 
              | Processes of Substances, Products and Materials | 
              | Processing Centre | 
              | Procetofen use Fenofibrate | 
              | Prochlorococcus | 
              | Prochloron | 
              | Prochlorophytes | 
              | Prochlorothrix | 
              | Prochlorperazine | 
              | Procollagen | 
              | Procollagen N-Endopeptidase | 
              | Procollagen Peptidase use Procollagen N-Endopeptidase | 
              | Procollagen Type I use Collagen Type I | 
              | Procollagen-Lysine, 2-Oxoglutarate 5-Dioxygenase | 
              | Procollagen-Proline Dioxygenase | 
              | Procolobus use Colobus | 
              | Proconvertin use Factor VII | 
              | Proctitis | 
              | Proctocolectomy, Restorative | 
              | Proctocolitis | 
              | Proctocolitis, Hemorrhagic use Proctocolitis | 
              | Proctocolitis, Ulcerative use Proctocolitis | 
              | Proctology use Colorectal Surgery | 
              | Proctoscopes | 
              | Proctoscopic Surgical Procedures use Proctoscopy | 
              | Proctoscopy | 
              | Proctosigmoiditis use Proctocolitis | 
              | Proctosigmoidoscopy use Sigmoidoscopy | 
              | Procyclidine | 
              | Procyon use Raccoons | 
              | Procyonidae | 
              | PROD use Cytochrome P-450 CYP2B1 | 
              | Prodigiosin | 
              | Prodigiozan | 
              | Prodine use Alphaprodine | 
              | Prodromal Symptoms | 
              | Prodrugs | 
              | Produce, Agricultural use Crops, Agricultural | 
              | Product Containers use Product Packaging | 
              | Product Labeling | 
              | Product Labeling, Drug use Drug Labeling | 
              | Product Labeling, Food use Food Labeling | 
              | Product Line Management | 
              | Product Packaging | 
              | Product Recalls and Withdrawals | 
              | Product Recycling use Equipment Reuse | 
              | Product Release | 
              | Product Storage | 
              | Product Surveillance, Postmarketing | 
              | Product Synthesis | 
              | Product Withdrawal use Product Recalls and Withdrawals | 
              | Product Withdrawal from Market use Product Recalls and Withdrawals | 
              | Production of Products | 
              | Production of Substances, Products and Materials | 
              | Productivity use Efficiency | 
              | Productivity, Organizational use Efficiency, Organizational | 
              | Products Advertising Control use Products Publicity Control | 
              | Products and Materials use Substances, Products and Materials | 
              | Products Arrest | 
              | Products Commerce | 
              | Products Commerce Suspension use Products Suspension | 
              | Products Commercialization use Products Commerce | 
              | Products Distribution | 
              | Products Exportation use Exportation of Products | 
              | Products for Amateur Gardening use Gardening Products | 
              | Products for Bath and Immersion | 
              | Products for Bathing and Immersion use Products for Bath and Immersion | 
              | Products for Beard | 
              | Products for Eye Areas | 
              | Products for Facial Makeup | 
              | Products for Gardening use Gardening Products | 
              | Products for Lips use Lip Products | 
              | Products for Nails and Cuticles | 
              | Products for Oral and Dental Hygiene use Oral and Dental Hygiene Products | 
              | Products for Ornamental Plants use Gardening Products | 
              | Products for Personal Hygiene use Personal Hygiene Products | 
              | Products for Professional Use use Products of Institution Restricted Sale | 
              | Products for SkinTanning use Skin Tannings | 
              | Products Importation use Importation of Products | 
              | Products Manufacturing Suspension use Products Suspension | 
              | Products of Confectionery use Foods of Confectionery | 
              | Products of Consumer Direct Sale | 
              | Products of Direct Sale to Consumer use Products of Consumer Direct Sale | 
              | Products of Free Sale use Products of Consumer Direct Sale | 
              | Products of Institution Restricted Sale | 
              | Products of Non-Professional Use use Products of Consumer Direct Sale | 
              | Products of Restricted Sale for Enterprises use Products of Institution Restricted Sale | 
              | Products of Restricted Sale for Entities use Products of Institution Restricted Sale | 
              | Products of Restricted Sale to Institution use Products of Institution Restricted Sale | 
              | Products of Risk I use Risk Grade I | 
              | Products of Risk II use Risk Grade II | 
              | Products Production use Production of Products | 
              | Products Promotion Control use Products Publicity Control | 
              | Products Publicity Control | 
              | Products Registration | 
              | Products Registration Certificate | 
              | Products Registration Certification use Products Registration Certificate | 
              | Products Retention use Products Arrest | 
              | Products Suspension | 
              | Products Technology | 
              | Products Transport | 
              | Products with Antimicrobial Action | 
              | Products Withdrawn from Market use Product Recalls and Withdrawals | 
              | Proenzymes use Enzyme Precursors | 
              | Proerythroblasts use Erythroblasts | 
              | Proestrus | 
              | Professional Activity Study use Commission on Professional and Hospital Activities | 
              | Professional Agencies use Professional Associations | 
              | Professional Associations | 
              | Professional Autonomy | 
              | Professional Clinic use Professional Practice | 
              | Professional Competence | 
              | Professional Corporations | 
              | Professional Delegation use Delegation, Professional | 
              | Professional Impairment | 
              | Professional Liability use Liability, Legal | 
              | Professional Misconduct | 
              | Professional Practice | 
              | Professional Practice Location | 
              | Professional Review Organizations | 
              | Professional Role | 
              | Professional Staff Committees | 
              | Professional Standards Review Organizations use Professional Review Organizations | 
              | Professional Training | 
              | Professional-Family Relations | 
              | Professional-Patient Relations | 
              | Professionals use Professional Associations | 
              | Professions use Occupations | 
              | Professor-Weed use Galega officinalis | 
              | Professorweed use Galega officinalis | 
              | Profibrinolysin use Plasminogen | 
              | Profilins | 
              | Proflavine | 
              | Progastricsin use Pepsinogen C | 
              | Progenitor B-Lymphocytes use Precursor Cells, B-Lymphoid | 
              | Progenitor Cells use Stem Cells | 
              | Progenitor Cells, Erythropoietic use Erythroid Precursor Cells | 
              | Progenitor Cells, Hematopoietic use Hematopoietic Stem Cells | 
              | Progeria | 
              | Progeria, Adult use Werner Syndrome | 
              | Progeria-Like Syndrome use Cockayne Syndrome | 
              | Progesterone | 
              | Progesterone Congeners | 
              | Progesterone Receptors use Receptors, Progesterone | 
              | Progesterone Reductase | 
              | Progesterone-Binding Globulin | 
              | Progestin Receptors use Receptors, Progesterone | 
              | Progestins | 
              | Progestogens use Progestins | 
              | Proglucagon | 
              | Proglumide | 
              | Prognathism | 
              | Prognosis | 
              | Prognostic Nutritional Index (PNI) use Nutrition Assessment | 
              | Prognostic Observations use Clinical-Dynamic Prognosis in Homeopathy | 
              | Progonoma, Melanotic use Neuroectodermal Tumor, Melanotic | 
              | Program Accreditation | 
              | Program Development | 
              | Program Efficiency use Efficiency, Organizational | 
              | Program Evaluation | 
              | Program Evaluation and Review Technique use Critical Path Method | 
              | Program Evaluation, Nursing use Nursing Evaluation Research | 
              | Program for Incentives and Benefits | 
              | Program of Risk Prevention on Working Environment | 
              | Programmable Implantable Insulin Pump use Insulin Infusion Systems | 
              | Programmable Implantable Medication Systems use Infusion Pumps, Implantable | 
              | Programmed Cell Death 1 Ligand 1 Protein use Antigens, CD274 | 
              | Programmed Cell Death 1 Ligand 2 Protein | 
              | Programmed Cell Death 1 Protein use Programmed Cell Death 1 Receptor | 
              | Programmed Cell Death 1 Receptor | 
              | Programmed Instruction | 
              | Programmed Instruction as Topic | 
              | Programmed Instruction, Computerized use Computer-Assisted Instruction | 
              | Programmed Learning use Programmed Instruction as Topic | 
              | Programming | 
              | Programming Languages | 
              | Programming, Linear | 
              | Programs | 
              | Programs as Topic use Programming | 
              | Programs of Study | 
              | Progranulocytic Leukemia use Leukemia, Promyelocytic, Acute | 
              | Progression-Free Survival use Disease-Free Survival | 
              | Progressive Interstitial Pneumonia of Sheep use Pneumonia, Progressive Interstitial, of Sheep | 
              | Progressive Intracranial Occlusive Arteropathy (Moyamoya) use Moyamoya Disease | 
              | Progressive Multifocal Leukoencephalopathy use Leukoencephalopathy, Progressive Multifocal | 
              | Progressive Muscular Atrophy use Muscular Atrophy, Spinal | 
              | Progressive Myoclonic Epilepsy, Lafora Type use Lafora Disease | 
              | Progressive Nonfluent Aphasia use Primary Progressive Nonfluent Aphasia | 
              | Progressive Patient Care | 
              | Progressive Scale | 
              | Progressive Supranuclear Ophthalmoplegia use Supranuclear Palsy, Progressive | 
              | Progressive Torsion Spasm use Dystonia Musculorum Deformans | 
              | Proguanil | 
              | Prohibited Substances in Cosmetics use Additives in Cosmetics | 
              | Prohibited Substances in Sanitizing use Additives in Sanitizing Products | 
              | Prohormone Convertase, PC2 use Proprotein Convertase 2 | 
              | Prohormone Convertase, PC5 use Proprotein Convertase 5 | 
              | Prohormone Convertases use Proprotein Convertases | 
              | Proinsulin | 
              | Proinsulin C-Peptide use C-Peptide | 
              | Project Analysis use Programming | 
              | Project Evaluation use Program Evaluation | 
              | Project Formulation | 
              | Project Reports | 
              | Projection | 
              | Projections and Predictions use Forecasting | 
              | Projective Techniques | 
              | Projects | 
              | Prokaryotic Cells | 
              | Prokaryotic Initiation Factor-1 | 
              | Prokaryotic Initiation Factor-2 | 
              | Prokaryotic Initiation Factor-3 | 
              | Prokaryotic Initiation Factors | 
              | Prolactin | 
              | Prolactin Hypersecretion Syndrome use Hyperprolactinemia | 
              | Prolactin Receptors use Receptors, Prolactin | 
              | Prolactin Release-Inhibiting Factors | 
              | Prolactin, Inappropriate Secretion use Hyperprolactinemia | 
              | Prolactin-Releasing Hormone | 
              | Prolactinoma | 
              | Prolamins | 
              | Prolapse | 
              | Prolapsed Disk use Intervertebral Disc Displacement | 
              | Prolidase Deficiency | 
              | Proliferating Cell Nuclear Antigen | 
              | Proline | 
              | Proline Dehydrogenase use Proline Oxidase | 
              | Proline Hydroxylase use Prolyl Hydroxylases | 
              | Proline Oxidase | 
              | Proline,2-Oxoglutarate 4-Dioxygenase use Prolyl Hydroxylases | 
              | Proline-Directed Protein Kinases | 
              | Proline-Rich Protein Domains | 
              | Proline-Specific tRNA use RNA, Transfer, Pro | 
              | Prolonged Aeration Activated Sludge use Prolonged Aeration Activated Sludges | 
              | Prolonged Aeration Activated Sludges | 
              | Prolonged-Action Preparations use Delayed-Action Preparations | 
              | Prolyl Hydroxylases | 
              | Prolyl Isomerase use Peptidylprolyl Isomerase | 
              | Prolyl-Hydroxylase Inhibitors | 
              | Prolyl-Leucyl-Glycinamide use MSH Release-Inhibiting Hormone | 
              | Prolymphocytic Leukemia use Leukemia, Prolymphocytic | 
              | Promazine | 
              | Promedol | 
              | Promegestone | 
              | Promestone use Promegestone | 
              | Prometaphase | 
              | Promethazine | 
              | Promethium | 
              | Prometryne | 
              | Promonocytes use Monocyte-Macrophage Precursor Cells | 
              | Promoter Regions, Genetic | 
              | Promotion of Health use Health Promotion | 
              | Promyelocytes use Granulocyte Precursor Cells | 
              | Promyelocytic Leukemia, Acute use Leukemia, Promyelocytic, Acute | 
              | Pronase | 
              | Pronation | 
              | Prone Position | 
              | Pronephros | 
              | Pronormoblasts use Erythroblasts | 
              | Pronuclear Stage Transfer use Zygote Intrafallopian Transfer | 
              | PROPAC use Prospective Payment Assessment Commission | 
              | Propafenone | 
              | Propaganda | 
              | Propane | 
              | Propanedial use Malondialdehyde | 
              | Propanediol Dehydratase | 
              | Propanediols use Propylene Glycols | 
              | Propanidid | 
              | Propanil | 
              | Propanol use 1-Propanol | 
              | Propanolamines | 
              | Propanolide use Propiolactone | 
              | Propanols | 
              | Propantheline | 
              | Propellant Gas use Gas for Packing | 
              | Propene Polymers use Polypropylenes | 
              | Propensity Score | 
              | Propenylacrylic Acid use Sorbic Acid | 
              | Properdin | 
              | Properdin Factor B use Complement Factor B | 
              | Properdin Factor D use Complement Factor D | 
              | Properdin Pathway use Complement Pathway, Alternative | 
              | Prophage Excision use Virus Activation | 
              | Prophage Induction use Virus Activation | 
              | Prophage Integration use Lysogeny | 
              | Prophages | 
              | Prophase | 
              | Propheniramine use Pheniramine | 
              | Prophenpyridamine use Pheniramine | 
              | Prophylactic Surgical Procedures | 
              | Propidium | 
              | Propilin use Fimbriae Proteins | 
              | Propiodone use Propyliodone | 
              | Propiolactone | 
              | Propionates | 
              | Propionibacteriaceae | 
              | Propionibacterium | 
              | Propionibacterium acnes | 
              | Propionic Acidemia | 
              | Propionicacidemia use Propionic Acidemia | 
              | Propionigenium | 
              | Propionyl-CoA Carboxylase use Methylmalonyl-CoA Decarboxylase | 
              | Propionyl-CoA Carboxylase Deficiency use Propionic Acidemia | 
              | Propiophenones | 
              | Propitocaine use Prilocaine | 
              | Proplast | 
              | Propofol | 
              | Propolis | 
              | Proportional Hazards Models | 
              | Propoxur | 
              | Propoxycaine | 
              | Propoxyprocaine use Propoxycaine | 
              | Propranolol | 
              | Proprietary Drug Name | 
              | Proprietary Drug Names use Proprietary Drug Name | 
              | Proprietary Name (Drug) use Proprietary Drug Name | 
              | Proprioception | 
              | Proprioceptive Disorders use Somatosensory Disorders | 
              | Proprotein Convertase use Proprotein Convertases | 
              | Proprotein Convertase 1 | 
              | Proprotein Convertase 2 | 
              | Proprotein Convertase 5 | 
              | Proprotein Convertases | 
              | Proptosis use Exophthalmos | 
              | Propyl Gallate | 
              | Propyladiphenin use Proadifen | 
              | Propylamine Transferase use Spermidine Synthase | 
              | Propylamines | 
              | Propylaminum | 
              | Propylbenzilylcholine Mustard | 
              | Propylene Glycol | 
              | Propylene Glycols | 
              | Propylene Polymers use Polypropylenes | 
              | Propyliodone | 
              | Propylthiouracil | 
              | Proscillaridin | 
              | Proscillaridin A use Proscillaridin | 
              | Prosencephalon | 
              | Prosimii use Strepsirhini | 
              | Prosopagnosia | 
              | Prosopis | 
              | Prosoposibiography use Biopathographical History | 
              | Prospective Payment Assessment Commission | 
              | Prospective Payment System | 
              | Prospective Pricing use Prospective Payment System | 
              | Prospective Reimbursement use Prospective Payment System | 
              | Prospective Studies | 
              | Prospectuses | 
              | Prospidin use Prospidium | 
              | Prospidium | 
              | PROST use Zygote Intrafallopian Transfer | 
              | Prostacyclin use Epoprostenol | 
              | Prostacyclin Receptor use Receptors, Epoprostenol | 
              | Prostaglandin A Analogs use Prostaglandins A, Synthetic | 
              | Prostaglandin Analogs use Prostaglandins, Synthetic | 
              | Prostaglandin Antagonists | 
              | Prostaglandin D2 | 
              | Prostaglandin delta-13-Reductase use 15-Oxoprostaglandin 13-Reductase | 
              | Prostaglandin E Analogs use Prostaglandins E, Synthetic | 
              | Prostaglandin E Receptors use Receptors, Prostaglandin E | 
              | Prostaglandin E1 use Alprostadil | 
              | Prostaglandin E2 use Dinoprostone | 
              | Prostaglandin E2alpha use Dinoprostone | 
              | Prostaglandin Endoperoxide Analogs use Prostaglandin Endoperoxides, Synthetic | 
              | Prostaglandin Endoperoxide Synthase Inhibitors use Cyclooxygenase Inhibitors | 
              | Prostaglandin Endoperoxides | 
              | Prostaglandin Endoperoxides, Synthetic | 
              | Prostaglandin F Analogs use Prostaglandins F, Synthetic | 
              | Prostaglandin F2 use Dinoprost | 
              | Prostaglandin F2alpha use Dinoprost | 
              | Prostaglandin H Synthase use Prostaglandin-Endoperoxide Synthases | 
              | Prostaglandin H Synthase-1 use Cyclooxygenase 1 | 
              | Prostaglandin H2 | 
              | Prostaglandin H2 Receptor use Receptors, Thromboxane A2, Prostaglandin H2 | 
              | Prostaglandin I2 use Epoprostenol | 
              | Prostaglandin Inhibitors use Prostaglandin Antagonists | 
              | Prostaglandin Receptors use Receptors, Prostaglandin | 
              | Prostaglandin Synthase use Prostaglandin-Endoperoxide Synthases | 
              | Prostaglandin Synthase Inhibitors use Cyclooxygenase Inhibitors | 
              | Prostaglandin Synthesis Antagonists use Cyclooxygenase Inhibitors | 
              | Prostaglandin-13,14-Reductase use 15-Oxoprostaglandin 13-Reductase | 
              | Prostaglandin-Endoperoxide Synthase use Prostaglandin-Endoperoxide Synthases | 
              | Prostaglandin-Endoperoxide Synthases | 
              | Prostaglandins | 
              | Prostaglandins A | 
              | Prostaglandins A, Synthetic | 
              | Prostaglandins B | 
              | Prostaglandins D | 
              | Prostaglandins E | 
              | Prostaglandins E, Synthetic | 
              | Prostaglandins F | 
              | Prostaglandins F, Synthetic | 
              | Prostaglandins G | 
              | Prostaglandins H | 
              | Prostaglandins I | 
              | Prostaglandins, Synthetic | 
              | Prostanoic Acids | 
              | Prostate | 
              | Prostate Cancer use Prostatic Neoplasms | 
              | Prostate-Specific Antigen | 
              | Prostatectomy | 
              | Prostatectomy, Retropubic use Prostatectomy | 
              | Prostatectomy, Suprapubic use Prostatectomy | 
              | Prostatectomy, Transurethral use Transurethral Resection of Prostate | 
              | Prostatein | 
              | Prostatic Adenoma use Prostatic Hyperplasia | 
              | Prostatic Diseases | 
              | Prostatic Hyperplasia | 
              | Prostatic Hyperplasia, Benign use Prostatic Hyperplasia | 
              | Prostatic Hypertrophy use Prostatic Hyperplasia | 
              | Prostatic Hypertrophy, Benign use Prostatic Hyperplasia | 
              | Prostatic Intraepithelial Neoplasia | 
              | Prostatic Neoplasms | 
              | Prostatic Neoplasms, Castration-Resistant | 
              | Prostatic Secretory Proteins | 
              | Prostatism | 
              | Prostatitis | 
              | Prostheses and Implants | 
              | Prosthesis use Prostheses and Implants | 
              | Prosthesis Coloring | 
              | Prosthesis Design | 
              | Prosthesis Failure | 
              | Prosthesis Failure Analysis use Equipment Failure Analysis | 
              | Prosthesis Fitting | 
              | Prosthesis Implantation | 
              | Prosthesis Loosening use Prosthesis Failure | 
              | Prosthesis Retention | 
              | Prosthesis, Dental use Dental Prosthesis | 
              | Prosthesis, Heart Valve use Heart Valve Prosthesis | 
              | Prosthesis-Related Infections | 
              | Prosthodontics | 
              | Prostitution | 
              | Prostrate Sandmat use Euphorbia prostata | 
              | Prostrate Spurge use Euphorbia prostata | 
              | Protactinium | 
              | Protamine Kinase | 
              | Protamine Sulfate use Protamines | 
              | Protamines | 
              | Protea Plant use Proteaceae | 
              | Proteaceae | 
              | Protease Antagonists use Protease Inhibitors | 
              | Protease Inhibitors | 
              | Protease La | 
              | Protease Nexins | 
              | Protease Ti use Endopeptidase Clp | 
              | Protease-Activated Receptor 1 use Receptor, PAR-1 | 
              | Proteases use Peptide Hydrolases | 
              | Proteasome Endopeptidase Complex | 
              | Proteasome Inhibitors | 
              | Protected Areas | 
              | Protected Sex use Safe Sex | 
              | Protected Springs | 
              | Protectin use Antigens, CD59 | 
              | Protection | 
              | Protective Agents | 
              | Protective Clothing | 
              | Protective Devices | 
              | Protective Factors | 
              | Protective Gloves use Gloves, Protective | 
              | Proteidae | 
              | Protein A use Staphylococcal Protein A | 
              | Protein Aggregates | 
              | Protein Aggregation, Pathological | 
              | Protein Arginine Methyltransferase use Protein-Arginine N-Methyltransferases | 
              | Protein Array Analysis | 
              | Protein Binding | 
              | Protein Biosynthesis | 
              | Protein C | 
              | Protein C Deficiency | 
              | Protein C Inhibitor | 
              | Protein Carbonylation | 
              | Protein Carboxylmethyltransferase use Protein O-Methyltransferase | 
              | Protein Chips use Protein Array Analysis | 
              | Protein Coding Region use Open Reading Frames | 
              | Protein Conformation | 
              | Protein Conformation, alpha-Helical use Protein Structure, Secondary | 
              | Protein Conformation, beta-Sheet use Protein Structure, Secondary | 
              | Protein Conformation, beta-Strand use Protein Structure, Secondary | 
              | Protein D-Aspartate-L-Isoaspartate Methyltransferase | 
              | Protein Databases use Databases, Protein | 
              | Protein Deficiency | 
              | Protein Degradation End Products | 
              | Protein Denaturation | 
              | Protein Disulfide Isomerase use Protein Disulfide-Isomerases | 
              | Protein Disulfide Reductase (Glutathione) | 
              | Protein Disulfide-Isomerase use Protein Disulfide-Isomerases | 
              | Protein Disulfide-Isomerases | 
              | Protein Domains use Protein Structure, Tertiary | 
              | Protein Engineering | 
              | Protein Fingerprinting use Peptide Mapping | 
              | Protein Folding | 
              | Protein Folding, Globular use Protein Folding | 
              | Protein Foods use Foods for Persons Engaged in Physical Activities | 
              | Protein Footprinting | 
              | Protein Glycosylation use Glycosylation | 
              | Protein Hydrolysates | 
              | Protein Inhibitors of Activated STAT | 
              | Protein Interaction Domains use Protein Interaction Domains and Motifs | 
              | Protein Interaction Domains and Motifs | 
              | Protein Interaction Mapping | 
              | Protein Interaction Maps | 
              | Protein Interaction Motifs use Protein Interaction Domains and Motifs | 
              | Protein Introns use Inteins | 
              | Protein Isoforms | 
              | Protein Isoprenylation use Protein Prenylation | 
              | Protein Kinase A use Cyclic AMP-Dependent Protein Kinases | 
              | Protein Kinase A, Catalytic Subunits use Cyclic AMP-Dependent Protein Kinase Catalytic Subunits | 
              | Protein Kinase A, RIalpha Subunit use Cyclic AMP-Dependent Protein Kinase RIalpha Subunit | 
              | Protein Kinase A, RIbeta Subunit use Cyclic AMP-Dependent Protein Kinase RIbeta Subunit | 
              | Protein Kinase A, RII alpha Subunit use Cyclic AMP-Dependent Protein Kinase RIIalpha Subunit | 
              | Protein Kinase A, RII beta Subunit use Cyclic AMP-Dependent Protein Kinase RIIbeta Subunit | 
              | Protein Kinase A, Type I use Cyclic AMP-Dependent Protein Kinase Type I | 
              | Protein Kinase A, Type II use Cyclic AMP-Dependent Protein Kinase Type II | 
              | Protein Kinase C | 
              | Protein Kinase C beta | 
              | Protein Kinase C-alpha | 
              | Protein Kinase C-delta | 
              | Protein Kinase C-epsilon | 
              | Protein Kinase Inhibitors | 
              | Protein Kinase PKR use eIF-2 Kinase | 
              | Protein Kinase Type I, Cyclic AMP-Dependent use Cyclic AMP-Dependent Protein Kinase Type I | 
              | Protein Kinase Type II, Cyclic AMP-Dependent use Cyclic AMP-Dependent Protein Kinase Type II | 
              | Protein Kinase, RNA Activated use eIF-2 Kinase | 
              | Protein Kinases | 
              | Protein Lysine Methyltransferase use Histone-Lysine N-Methyltransferase | 
              | Protein Malnutrition | 
              | Protein Methylase I use Protein-Arginine N-Methyltransferases | 
              | Protein Methylase II use Protein O-Methyltransferase | 
              | Protein Methylase III use Histone-Lysine N-Methyltransferase | 
              | Protein Methylases use Protein Methyltransferases | 
              | Protein Methyltransferase I use Protein-Arginine N-Methyltransferases | 
              | Protein Methyltransferase II use Protein O-Methyltransferase | 
              | Protein Methyltransferase III use Histone-Lysine N-Methyltransferase | 
              | Protein Methyltransferases | 
              | Protein Microarrays use Protein Array Analysis | 
              | Protein Microchips use Protein Array Analysis | 
              | Protein Misfolding Disorders use Proteostasis Deficiencies | 
              | Protein Modification, Co-Translational use Protein Modification, Translational | 
              | Protein Modification, Post-Translational use Protein Processing, Post-Translational | 
              | Protein Modification, Translational | 
              | Protein Motifs use Amino Acid Motifs | 
              | Protein Multimerization | 
              | Protein NMR Spectroscopy use Nuclear Magnetic Resonance, Biomolecular | 
              | Protein O-Methyltransferase | 
              | Protein p34cdc2 use CDC2 Protein Kinase | 
              | Protein Phosphatase 1 | 
              | Protein Phosphatase 2 | 
              | Protein Phosphatase-2B use Calcineurin | 
              | Protein Phosphatases use Phosphoprotein Phosphatases | 
              | Protein Precursors | 
              | Protein Prenylation | 
              | Protein Processing, Co-Translational use Protein Modification, Translational | 
              | Protein Processing, Post-Translational | 
              | Protein Processing, Translational use Protein Modification, Translational | 
              | Protein Profiling Chips use Protein Array Analysis | 
              | Protein Refolding | 
              | Protein Renaturation | 
              | Protein Requirement | 
              | Protein S | 
              | Protein S Deficiency | 
              | Protein Sequence Analysis use Sequence Analysis, Protein | 
              | Protein Sequence Databases use Databases, Protein | 
              | Protein Sorting Signals | 
              | Protein Splicing | 
              | Protein Stability | 
              | Protein Structural Homology use Structural Homology, Protein | 
              | Protein Structure, Primary use Amino Acid Sequence | 
              | Protein Structure, Quaternary | 
              | Protein Structure, Secondary | 
              | Protein Structure, Supersecondary use Amino Acid Motifs | 
              | Protein Structure, Tertiary | 
              | Protein Subunits | 
              | Protein Synthesis Antagonists use Protein Synthesis Inhibitors | 
              | Protein Synthesis Inhibitors | 
              | Protein Translation use Protein Biosynthesis | 
              | Protein Translocation use Protein Transport | 
              | Protein Transport | 
              | Protein Tyrosine Kinase p56(lck) use Lymphocyte Specific Protein Tyrosine Kinase p56(lck) | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 1 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 11 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 12 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 13 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 2 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 22 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 3 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 4 | 
              | Protein Tyrosine Phosphatase, Non-Receptor Type 6 | 
              | Protein Tyrosine Phosphatase, Receptor Type A use Receptor-Like Protein Tyrosine Phosphatases, Class 4 | 
              | Protein Tyrosine Phosphatase, Receptor Type B use Receptor-Like Protein Tyrosine Phosphatases, Class 3 | 
              | Protein Tyrosine Phosphatase, Receptor Type D use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
              | Protein Tyrosine Phosphatase, Receptor Type E use Receptor-Like Protein Tyrosine Phosphatases, Class 4 | 
              | Protein Tyrosine Phosphatase, Receptor Type F use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
              | Protein Tyrosine Phosphatase, Receptor Type G use Receptor-Like Protein Tyrosine Phosphatases, Class 5 | 
              | Protein Tyrosine Phosphatase, Receptor Type H use Receptor-Like Protein Tyrosine Phosphatases, Class 3 | 
              | Protein Tyrosine Phosphatase, Receptor Type J use Receptor-Like Protein Tyrosine Phosphatases, Class 3 | 
              | Protein Tyrosine Phosphatase, Receptor Type K use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
              | Protein Tyrosine Phosphatase, Receptor Type M use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
              | Protein Tyrosine Phosphatase, Receptor Type N use Receptor-Like Protein Tyrosine Phosphatases, Class 8 | 
              | Protein Tyrosine Phosphatase, Receptor Type O use Receptor-Like Protein Tyrosine Phosphatases, Class 3 | 
              | Protein Tyrosine Phosphatase, Receptor Type Q use Receptor-Like Protein Tyrosine Phosphatases, Class 3 | 
              | Protein Tyrosine Phosphatase, Receptor Type R use Receptor-Like Protein Tyrosine Phosphatases, Class 7 | 
              | Protein Tyrosine Phosphatase, Receptor Type S use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
              | Protein Tyrosine Phosphatase, Receptor Type T use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
              | Protein Tyrosine Phosphatase, Receptor Type U use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
              | Protein Tyrosine Phosphatase, Receptor Type V use Receptor-Like Protein Tyrosine Phosphatases, Class 3 | 
              | Protein Tyrosine Phosphatase, Receptor Type Z use Receptor-Like Protein Tyrosine Phosphatases, Class 5 | 
              | Protein Tyrosine Phosphatase, Receptor Type, C use Antigens, CD45 | 
              | Protein Tyrosine Phosphatases | 
              | Protein Tyrosine Phosphatases, Non-Receptor | 
              | Protein Unfolding | 
              | Protein-Arginine N-Methyltransferase use Protein-Arginine N-Methyltransferases | 
              | Protein-Arginine N-Methyltransferases | 
              | Protein-Binding Radioassay use Radioligand Assay | 
              | Protein-Bound Iodine Test use Thyroid Function Tests | 
              | Protein-Calorie Malnutrition use Protein-Energy Malnutrition | 
              | Protein-D-Aspartate Methyltransferase use Protein D-Aspartate-L-Isoaspartate Methyltransferase | 
              | Protein-Energy Malnutrition | 
              | Protein-Free Media use Culture Media, Serum-Free | 
              | Protein-Glutamine gamma-Glutamyltransferases use Transglutaminases | 
              | Protein-L-Isoaspartate-D-Aspartate-O-Methyltransferase use Protein D-Aspartate-L-Isoaspartate Methyltransferase | 
              | Protein-Losing Enteropathies | 
              | Protein-Lysine 6-Oxidase | 
              | Protein-Protein Interaction Map use Protein Interaction Maps | 
              | Protein-Restricted Diet use Diet, Protein-Restricted | 
              | Protein-Serine-Threonine Kinases | 
              | Protein-Tyrosine Kinase TRKC use Receptor, trkC | 
              | Protein-Tyrosine Kinases | 
              | Protein-Tyrosine Kinases, src use src-Family Kinases | 
              | Protein-Tyrosine-Phosphatase use Protein Tyrosine Phosphatases | 
              | Proteinase Activated Receptor 2 use Receptor, PAR-2 | 
              | Proteinase Inhibitory Peptides, Secretory use Proteinase Inhibitory Proteins, Secretory | 
              | Proteinase Inhibitory Proteins, Secretory | 
              | Proteinase K use Endopeptidase K | 
              | Proteinases use Peptide Hydrolases | 
              | Proteins | 
              | Proteins, Acute-Phase use Acute-Phase Proteins | 
              | Proteins, Dietary use Dietary Proteins | 
              | Proteins, Immediate-Early use Immediate-Early Proteins | 
              | Proteins, Mitochondrial use Mitochondrial Proteins | 
              | Proteins, Ribosomal use Ribosomal Proteins | 
              | Proteinuria | 
              | Proteles use Hyaenidae | 
              | Proteobacteria | 
              | Proteochondroitin Sulfates use Chondroitin Sulfate Proteoglycans | 
              | Proteoglycans | 
              | Proteolipid Protein, Myelin use Myelin Proteolipid Protein | 
              | Proteolipids | 
              | Proteolysis | 
              | Proteolytic Enzymes use Peptide Hydrolases | 
              | Proteome | 
              | Proteomics | 
              | Proteostasis Deficiencies | 
              | Protestantism | 
              | Proteus | 
              | Proteus Infections | 
              | Proteus mirabilis | 
              | Proteus penneri | 
              | Proteus Syndrome | 
              | Proteus vulgaris | 
              | Prothionamide | 
              | Prothrombin | 
              | Prothrombin Deficiency use Hypoprothrombinemias | 
              | Prothrombin Time | 
              | Protirelin use Thyrotropin-Releasing Hormone | 
              | Protirelin Receptors use Receptors, Thyrotropin-Releasing Hormone | 
              | Proto-Oncogene Protein c-ets-1 | 
              | Proto-Oncogene Protein c-ets-2 | 
              | Proto-Oncogene Protein c-fli-1 | 
              | Proto-Oncogene Protein c-hck use Proto-Oncogene Proteins c-hck | 
              | Proto-Oncogene Protein c-yes use Proto-Oncogene Proteins c-yes | 
              | Proto-Oncogene Protein erbB-3 use Receptor, ErbB-3 | 
              | Proto-Oncogene Protein ets-1 use Proto-Oncogene Protein c-ets-1 | 
              | Proto-Oncogene Protein ets-2 use Proto-Oncogene Protein c-ets-2 | 
              | Proto-Oncogene Protein fms use Receptor, Macrophage Colony-Stimulating Factor | 
              | Proto-Oncogene Protein HER-2 use Receptor, ErbB-2 | 
              | Proto-Oncogene Protein Int-1 use Wnt1 Protein | 
              | Proto-Oncogene Protein p185(neu) use Receptor, ErbB-2 | 
              | Proto-Oncogene Protein p60(fyn) use Proto-Oncogene Proteins c-fyn | 
              | Proto-Oncogene Protein trk use Receptor, trkA | 
              | Proto-Oncogene Protein Wnt-1 use Wnt1 Protein | 
              | Proto-Oncogene Protein Wnt-2 use Wnt2 Protein | 
              | Proto-Oncogene Proteins | 
              | Proto-Oncogene Proteins A-raf | 
              | Proto-Oncogene Proteins B-raf | 
              | Proto-Oncogene Proteins c-abl | 
              | Proto-Oncogene Proteins c-akt | 
              | Proto-Oncogene Proteins c-bcl-1 use Cyclin D1 | 
              | Proto-Oncogene Proteins c-bcl-2 | 
              | Proto-Oncogene Proteins c-bcl-6 | 
              | Proto-Oncogene Proteins c-bcr | 
              | Proto-Oncogene Proteins c-cbl | 
              | Proto-Oncogene Proteins c-crk | 
              | Proto-Oncogene Proteins c-erbA use Thyroid Hormone Receptors alpha | 
              | Proto-Oncogene Proteins c-ets | 
              | Proto-Oncogene Proteins c-fes | 
              | Proto-Oncogene Proteins c-fos | 
              | Proto-Oncogene Proteins c-fyn | 
              | Proto-Oncogene Proteins c-hck | 
              | Proto-Oncogene Proteins c-jun | 
              | Proto-Oncogene Proteins c-kit | 
              | Proto-Oncogene Proteins c-maf | 
              | Proto-Oncogene Proteins c-mdm2 | 
              | Proto-Oncogene Proteins c-met | 
              | Proto-Oncogene Proteins c-mos | 
              | Proto-Oncogene Proteins c-myb | 
              | Proto-Oncogene Proteins c-myc | 
              | Proto-Oncogene Proteins c-pim-1 | 
              | Proto-Oncogene Proteins c-raf | 
              | Proto-Oncogene Proteins c-ras use Proto-Oncogene Proteins p21(ras) | 
              | Proto-Oncogene Proteins c-rel | 
              | Proto-Oncogene Proteins c-ret | 
              | Proto-Oncogene Proteins c-sis | 
              | Proto-Oncogene Proteins c-vav | 
              | Proto-Oncogene Proteins c-yes | 
              | Proto-Oncogene Proteins p21(ras) | 
              | Proto-Oncogene Proteins pp60(c-src) | 
              | Proto-Oncogenes | 
              | Protocatechuate-3,4-Dioxygenase | 
              | Protochlorophyllide | 
              | Protochlorophyllide A use Protochlorophyllide | 
              | Protocol Compliance use Guideline Adherence | 
              | Protocol Drug Therapy, Computer-Assisted use Drug Therapy, Computer-Assisted | 
              | Protocol Refugee | 
              | Protocol-Directed Therapy, Computer-Assisted use Therapy, Computer-Assisted | 
              | Protocollagen use Procollagen | 
              | Protocollagen Lysyl Hydroxylase use Procollagen-Lysine, 2-Oxoglutarate 5-Dioxygenase | 
              | Protocollagen Prolyl Hydroxylase use Procollagen-Proline Dioxygenase | 
              | Protocols | 
              | Protocols, Clinical use Clinical Protocols | 
              | Protoheme use Heme | 
              | Protomers use Protein Subunits | 
              | Protomonas use Methylobacteriaceae | 
              | Proton Ionophores | 
              | Proton Magnetic Resonance Spectroscopy | 
              | Proton Pump Inhibitors | 
              | Proton Pumps | 
              | Proton Therapy | 
              | Proton-Coupled Folate Transporter | 
              | Proton-Gated Sodium Channel Blockers use Acid Sensing Ion Channel Blockers | 
              | Proton-Gated Sodium Channels use Acid Sensing Ion Channels | 
              | Proton-Induced X-Ray Emission Spectrometry use Spectrometry, X-Ray Emission | 
              | Proton-Motive Force | 
              | Proton-Phosphate Symporters | 
              | Proton-Translocating ATPase use Proton-Translocating ATPases | 
              | Proton-Translocating ATPase Complex use Proton-Translocating ATPases | 
              | Proton-Translocating ATPase Complexes use Proton-Translocating ATPases | 
              | Proton-Translocating ATPases | 
              | Protons | 
              | Protoplasm use Cytoplasm | 
              | Protoplasmic Streaming use Cytoplasmic Streaming | 
              | Protoplasts | 
              | Protoporphyria, Erythropoietic | 
              | Protoporphyrinogen Oxidase | 
              | Protoporphyrins | 
              | Protosteliomycetes use Myxomycetes | 
              | Prototheca | 
              | Protoveratrines | 
              | Protoverin use Protoveratrines | 
              | Protozoal Infections, Central Nervous System use Central Nervous System Protozoal Infections | 
              | Protozoan Antibodies use Antibodies, Protozoan | 
              | Protozoan Antigens use Antigens, Protozoan | 
              | Protozoan DNA use DNA, Protozoan | 
              | Protozoan Genes use Genes, Protozoan | 
              | Protozoan Genome use Genome, Protozoan | 
              | Protozoan Infections | 
              | Protozoan Infections, Animal | 
              | Protozoan Proteins | 
              | Protozoan RNA use RNA, Protozoan | 
              | Protozoan Vaccines | 
              | Protriptyline | 
              | Protrusive Dome | 
              | Proventriculus | 
              | Prover | 
              | Proverbs use Aphorisms and Proverbs | 
              | Providencia | 
              | Provider-Sponsored Organizations | 
              | Provincial Government use State Government | 
              | Provirus Integration use Virus Integration | 
              | Proviruses | 
              | Provision use Supply | 
              | Provisional Draft Bill use Draft Bill | 
              | Provisional Measure use Provisional Measures | 
              | Provisional Measures | 
              | Provocation Tests, Bronchial use Bronchial Provocation Tests | 
              | Provocation Tests, Nasal use Nasal Provocation Tests | 
              | Proxemics use Behavioral Sciences | 
              | Proximal Renal Tubular Dysfunction use Fanconi Syndrome | 
              | Proxy | 
              | PrP 27-30 Protein | 
              | PrP Proteins use Prions | 
              | PrPC Proteins | 
              | PRPP Synthetase use Ribose-Phosphate Pyrophosphokinase | 
              | PrPSc Proteins | 
              | PRRS use Porcine Reproductive and Respiratory Syndrome | 
              | PRRSV use Porcine respiratory and reproductive syndrome virus | 
              | Prune Belly Syndrome | 
              | Prune, African use Pygeum | 
              | Prunella | 
              | Prunella vulgaris | 
              | Prunus | 
              | Prunus africana use Pygeum | 
              | Prunus amygdalus use Amygdalae amarae Aqua | 
              | Prunus armeniaca use Prunus | 
              | Prunus domestica | 
              | Prunus laurocerasus use Laurocerasus | 
              | Prunus mahaleb | 
              | Prunus padus | 
              | Prunus persica use Prunus | 
              | Prunus spinosa | 
              | Prunus virginiana | 
              | Prurigo | 
              | Pruritus | 
              | Pruritus Ani | 
              | Pruritus Vulvae | 
              | Prussia | 
              | Prussian Blue Reaction | 
              | Psacalium use Asteraceae | 
              | Psalliota bispora use Agaricus campestris | 
              | Psammomys use Gerbillinae | 
              | PSDA use Patient Self-Determination Act | 
              | Pseudacacia odorata use Robinia pseudacacia | 
              | Pseudallescheria | 
              | Pseudalopex use Foxes | 
              | Pseudarthrosis | 
              | Pseudo-Hurler Polydystrophy use Mucolipidoses | 
              | Pseudo-Obstruction, Intestinal use Intestinal Pseudo-Obstruction | 
              | Pseudoakathisia use Akathisia, Drug-Induced | 
              | Pseudoaldosteronism use Liddle Syndrome | 
              | Pseudoalteromonas | 
              | Pseudoaneurysm use Aneurysm, False | 
              | Pseudoaphakia use Cataract | 
              | Pseudobulbar Palsy | 
              | Pseudocholinesterase | 
              | Pseudocoma use Coma | 
              | Pseudocowpox virus | 
              | Pseudocyesis use Pseudopregnancy | 
              | Pseudodementia use Factitious Disorders | 
              | Pseudodystonia use Dystonic Disorders | 
              | Pseudoephedrine | 
              | Pseudoexfoliation Syndrome use Exfoliation Syndrome | 
              | Pseudogenes | 
              | Pseudoglobulins use Serum Globulins | 
              | Pseudoglucagonoma Syndrome use Necrolytic Migratory Erythema | 
              | Pseudogout use Chondrocalcinosis | 
              | Pseudohypoaldosteronism | 
              | Pseudohypoaldosteronism Type 1 use Pseudohypoaldosteronism | 
              | Pseudohypoaldosteronism Type 1, Autosomal Recessive use Pseudohypoaldosteronism | 
              | Pseudohypoaldosteronism, Type I use Pseudohypoaldosteronism | 
              | Pseudohypoaldosteronism, Type I, Autosomal Dominant use Pseudohypoaldosteronism | 
              | Pseudohypoaldosteronism, Type I, Autosomal Recessive use Pseudohypoaldosteronism | 
              | Pseudohypoaldosteronism, Type II use Pseudohypoaldosteronism | 
              | Pseudohypoparathyroidism | 
              | Pseudolymphoma | 
              | Pseudomelia use Phantom Limb | 
              | Pseudomeningitis use Meningism | 
              | Pseudomonadaceae | 
              | Pseudomonas | 
              | Pseudomonas acidovorans use Delftia acidovorans | 
              | Pseudomonas aeruginosa | 
              | Pseudomonas alcaligenes | 
              | Pseudomonas cepacia use Burkholderia cepacia | 
              | Pseudomonas fluorescens | 
              | Pseudomonas fragi | 
              | Pseudomonas Infections | 
              | Pseudomonas mallei use Burkholderia mallei | 
              | Pseudomonas mendocina | 
              | Pseudomonas oleovorans | 
              | Pseudomonas phage 7s use Leviviridae | 
              | Pseudomonas phage Pf1 use Bacteriophage Pf1 | 
              | Pseudomonas phage phi 6 use Bacteriophage phi 6 | 
              | Pseudomonas phage PP7 use Levivirus | 
              | Pseudomonas Phages | 
              | Pseudomonas pseudoalcaligenes | 
              | Pseudomonas pseudomallei use Burkholderia pseudomallei | 
              | Pseudomonas putida | 
              | Pseudomonas pyocyanea use Pseudomonas aeruginosa | 
              | Pseudomonas stutzeri | 
              | Pseudomonas syringae | 
              | Pseudomonas testosteroni use Comamonas testosteroni | 
              | Pseudomonas Vaccines | 
              | Pseudomonic Acid use Mupirocin | 
              | Pseudomyotonia use Isaacs Syndrome | 
              | Pseudomyxoma Peritonei | 
              | Pseudoneurotic Schizophrenia use Schizotypal Personality Disorder | 
              | Pseudonyms use Anonyms and Pseudonyms | 
              | Pseudopelade use Alopecia | 
              | Pseudophakia | 
              | Pseudopleuronectes use Flounder | 
              | Pseudopodia | 
              | Pseudopolyarthritis, Rhizomelic use Polymyalgia Rheumatica | 
              | Pseudopregnancy | 
              | Pseudopseudohypoparathyroidism | 
              | Pseudopsychopathic Schizophrenia use Schizotypal Personality Disorder | 
              | Pseudopsychosis use Factitious Disorders | 
              | Pseudorabies | 
              | Pseudorabies Vaccines | 
              | Pseudorabies virus use Herpesvirus 1, Suid | 
              | Pseudorotaxanes use Rotaxanes | 
              | Pseudosclerosis use Hepatolenticular Degeneration | 
              | Pseudotsuga | 
              | Pseudotuberculosis, Pasteurella use Yersinia pseudotuberculosis Infections | 
              | Pseudotumor Cerebri | 
              | Pseudotumor, Inflammatory use Granuloma, Plasma Cell | 
              | Pseudouridine | 
              | Pseudowintera | 
              | Pseudoxanthoma Elasticum | 
              | Psidium | 
              | Psilocybe | 
              | Psilocybine | 
              | Psittacidae use Parrots | 
              | Psittaciformes | 
              | Psittacines use Psittaciformes | 
              | Psittacosis | 
              | Psittacula | 
              | Psoas Abscess | 
              | Psoas Muscles | 
              | Psora use Psora in Homeopathy | 
              | Psora in Homeopathy | 
              | Psoralea | 
              | Psoralea bituminosa | 
              | Psoralen use Ficusin | 
              | Psoralen Ultraviolet A Therapy use PUVA Therapy | 
              | Psoralens use Furocoumarins | 
              | Psoriasis | 
              | Psoriasis Arthropathica use Arthritis, Psoriatic | 
              | Psoriasis, Arthritic use Arthritis, Psoriatic | 
              | Psoric Miasm use Psora in Homeopathy | 
              | Psoric Symptoms | 
              | Psoricum use Psorinum | 
              | Psorinum | 
              | Psoroptes use Psoroptidae | 
              | Psoroptes ovis use Psoroptidae | 
              | Psoroptidae | 
              | Psorospermum use Clusiaceae | 
              | PSRO use Professional Review Organizations | 
              | Psychedelic Agents use Hallucinogens | 
              | Psychiatric Aides | 
              | Psychiatric Department, Hospital | 
              | Psychiatric Hospital Orderlies use Psychiatric Aides | 
              | Psychiatric Nursing | 
              | Psychiatric Social Work use Social Work, Psychiatric | 
              | Psychiatric Somatic Therapies | 
              | Psychiatric Status Rating Scales | 
              | Psychiatric Ward Attendants use Psychiatric Aides | 
              | Psychiatrist use Psychiatry | 
              | Psychiatry | 
              | Psychiatry, Biological use Biological Psychiatry | 
              | Psychiatry, Community use Community Psychiatry | 
              | Psychiatry, Geriatric use Geriatric Psychiatry | 
              | Psychiatry, Military use Military Psychiatry | 
              | Psychic Denial of Blindness use Blindness, Cortical | 
              | Psychic Symptoms | 
              | Psychical Research use Parapsychology | 
              | Psychoacoustics | 
              | Psychoactive Agents use Psychotropic Drugs | 
              | Psychoanalysis | 
              | Psychoanalytic Interpretation | 
              | Psychoanalytic Theory | 
              | Psychoanalytic Therapy | 
              | Psychobacter Infections use Moraxellaceae Infections | 
              | Psychodidae | 
              | Psychodinae use Psychodidae | 
              | Psychodrama | 
              | Psychogenetics use Genetics, Behavioral | 
              | Psychogenic Headache use Tension-Type Headache | 
              | Psychogeriatrics use Geriatric Psychiatry | 
              | Psychoimmunology use Psychoneuroimmunology | 
              | Psycholinguistics | 
              | Psychological Extinction use Extinction, Psychological | 
              | Psychological Feedback use Feedback, Psychological | 
              | Psychological Phenomena and Processes | 
              | Psychological Techniques | 
              | Psychological Tests | 
              | Psychological Theory | 
              | Psychological Warfare | 
              | Psychologists | 
              | Psychology | 
              | Psychology, Adolescent | 
              | Psychology, Applied | 
              | Psychology, Child | 
              | Psychology, Clinical | 
              | Psychology, Comparative | 
              | Psychology, Criminal use Criminal Psychology | 
              | Psychology, Developmental | 
              | Psychology, Educational | 
              | Psychology, Experimental | 
              | Psychology, Health use Behavioral Medicine | 
              | Psychology, Industrial | 
              | Psychology, Medical | 
              | Psychology, Military | 
              | Psychology, Pastoral use Pastoral Care | 
              | Psychology, Physiological use Psychophysiology | 
              | Psychology, Schizophrenic use Schizophrenic Psychology | 
              | Psychology, Self use Self Psychology | 
              | Psychology, Social | 
              | Psychometrics | 
              | Psychomotor Agitation | 
              | Psychomotor Disorders | 
              | Psychomotor Impairment use Psychomotor Disorders | 
              | Psychomotor Performance | 
              | Psychoneuroimmunology | 
              | Psychoneuroses use Neurotic Disorders | 
              | Psychopathic Personality use Antisocial Personality Disorder | 
              | Psychopathology | 
              | Psychopharmaceuticals use Psychotropic Drugs | 
              | Psychopharmacology | 
              | Psychophysics | 
              | Psychophysiologic Disorders | 
              | Psychophysiology | 
              | Psychoses use Psychotic Disorders | 
              | Psychoses, Affective use Affective Disorders, Psychotic | 
              | Psychoses, Alcoholic | 
              | Psychoses, Drug use Psychoses, Substance-Induced | 
              | Psychoses, Paranoid use Paranoid Disorders | 
              | Psychoses, Substance-Induced | 
              | Psychoses, Toxic use Psychoses, Substance-Induced | 
              | Psychoses, Traumatic use Delirium, Dementia, Amnestic, Cognitive Disorders | 
              | Psychosexual Development | 
              | Psychosexual Disorders use Sexual Dysfunctions, Psychological | 
              | Psychosexual Dysfunctions use Sexual Dysfunctions, Psychological | 
              | Psychosine | 
              | Psychosis, Brief Reactive use Psychotic Disorders | 
              | Psychosis, Involutional use Depressive Disorder, Major | 
              | Psychosis, Manic-Depressive use Bipolar Disorder | 
              | Psychosocial Care Centers use Mental Health Services | 
              | Psychosocial Deprivation | 
              | Psychosocial Impact | 
              | Psychosocial Support Systems use Social Support | 
              | Psychosomatic Disorders use Psychophysiologic Disorders | 
              | Psychosomatic Medicine | 
              | Psychosurgery | 
              | Psychotherapeutic Processes | 
              | Psychotherapy | 
              | Psychotherapy, Brief | 
              | Psychotherapy, Cognitive use Cognitive Therapy | 
              | Psychotherapy, Group | 
              | Psychotherapy, Multiple | 
              | Psychotherapy, Psychodynamic | 
              | Psychotherapy, Rational use Psychotherapy, Rational-Emotive | 
              | Psychotherapy, Rational-Emotive | 
              | Psychotic Disorders | 
              | Psychotomimetic Agents use Hallucinogens | 
              | Psychotria | 
              | Psychotria ipecacuanha use Ipecacuanha | 
              | Psychotropic Drugs | 
              | Psychrobacter | 
              | Psyllids use Hemiptera | 
              | Psyllium | 
              | Psylloidea use Hemiptera | 
              | PTC use Factor IX | 
              | PtdIns use Phosphatidylinositols | 
              | PtdIns 3-Kinase use Phosphatidylinositol 3-Kinases | 
              | PtdIns 4-Kinase use 1-Phosphatidylinositol 4-Kinase | 
              | PtdInsP2 use Phosphatidylinositol 4,5-Diphosphate | 
              | Ptelea trifoliata | 
              | PTEN Hamartoma Tumor Syndrome use Hamartoma Syndrome, Multiple | 
              | PTEN Phosphohydrolase | 
              | Pteridaceae | 
              | Pteridines | 
              | Pteridium | 
              | Pteridophyta | 
              | Pterins | 
              | Pteris | 
              | Pterocarpans | 
              | Pterocarpus | 
              | Pterocarpus marsupium use Pterocarpus | 
              | Pteronura use Otters | 
              | Pteropodidae use Chiroptera | 
              | Pteropus use Chiroptera | 
              | Pteroyl Polyglutamate Hydrolase use gamma-Glutamyl Hydrolase | 
              | Pteroylglutamic Acid use Folic Acid | 
              | Pteroylpolyglutamic Acids | 
              | Pterygium | 
              | Pterygoid Muscles | 
              | Pterygopalatine Fossa | 
              | Ptilocercus use Tupaiidae | 
              | Ptosis, Eyelid use Blepharoptosis | 
              | PTSD use Stress Disorders, Post-Traumatic | 
              | Ptychopetalum use Olacaceae | 
              | Puberty | 
              | Puberty, Delayed | 
              | Puberty, Precocious | 
              | Pubic Bone | 
              | Pubic Symphysis | 
              | Pubic Symphysis Diastasis | 
              | Public Access to Information use Access to Information | 
              | Public Administration | 
              | Public Advocacy use Consumer Advocacy | 
              | Public Advocacy (Health Law) use Public Defender Legal Services | 
              | Public Assistance | 
              | Public Attorneys | 
              | Public Awareness | 
              | Public Defender Legal Services | 
              | Public Domain use Public Sector | 
              | Public Enterprise use Public Sector | 
              | Public Facilities | 
              | Public Gardens use Green Areas | 
              | Public Health | 
              | Public Health Administration | 
              | Public Health Dentistry | 
              | Public Health Department, Hospital use Health Centers | 
              | Public Health Informatics | 
              | Public Health Laboratories use Public Health Laboratory Services | 
              | Public Health Laboratory Services | 
              | Public Health Law use Health Law | 
              | Public Health Nurses use Nurses, Public Health | 
              | Public Health Nursing | 
              | Public Health Policies use Public Health Policy | 
              | Public Health Policy | 
              | Public Health Population Studies use Population Studies in Public Health | 
              | Public Health Practice | 
              | Public Health Schools use Schools, Public Health | 
              | Public Health Service (U.S.) use United States Public Health Service | 
              | Public Health Services, Laboratory use Public Health Laboratory Services | 
              | Public Health Students use Students, Public Health | 
              | Public Health Surveillance | 
              | Public Housing | 
              | Public Information | 
              | Public Law 101-508 use Patient Self-Determination Act | 
              | Public Law 104-191 use Health Insurance Portability and Accountability Act | 
              | Public Law 93-406 use Employee Retirement Income Security Act | 
              | Public Law 93-579 use Privacy | 
              | Public Law 97-248 use Tax Equity and Fiscal Responsibility Act | 
              | Public Legal Aid use Public Defender Legal Services | 
              | Public Opinion | 
              | Public Perception of Science | 
              | Public Policies | 
              | Public Policy | 
              | Public Power | 
              | Public Prosecutors use Public Attorneys | 
              | Public Relations | 
              | Public Sector | 
              | Public Speaking use Speech | 
              | Public Standposts | 
              | Public Toilet use Toilet Facilities | 
              | Public Water Consumption | 
              | Public Water Supply use Water Supply | 
              | Public Water Supply System use Water Supply | 
              | Public Water Supply Systems use Water Supply | 
              | Public Water-Supply Systems use Water Supply | 
              | Public Works | 
              | Public-Private Partnership use Public-Private Sector Partnerships | 
              | Public-Private Sector Partnerships | 
              | Publication Bias | 
              | Publication Components | 
              | Publication Formats | 
              | Publications | 
              | Publications for Science Diffusion | 
              | Publicity Regulation use Products Publicity Control | 
              | Published Erratum | 
              | Publishers' Catalogs use Catalogs, Publishers' | 
              | Publishing | 
              | Publishing, Dental Periodicals use Journalism, Dental | 
              | Publishing, Electronic use Publishing | 
              | PubMed | 
              | Puccoon use Lithospermum | 
              | Puddock-Stool use Hypophyllum sanguineum | 
              | Pudendal Nerve | 
              | Pudendal Neuralgia | 
              | Pueraria | 
              | Puericulture use Child Care | 
              | Puerperal Disorders | 
              | Puerperal Infection | 
              | Puerperium use Postpartum Period | 
              | Puerto Ricans use Hispanic Americans | 
              | Puerto Rico | 
              | Puff Adder use Clotho arictans | 
              | Puff-Ball use Bovista lycoperdon | 
              | Pufferfish use Tetraodontiformes | 
              | Puka puka use Brachyglottis repens | 
              | Puke-Weed use Lobelia inflata | 
              | Pulai use Alstonia scholaris | 
              | Pulegium vulgare use Mentha pulegium | 
              | Pulex irritans | 
              | Pulicaria | 
              | Pulmo anaphylacticus | 
              | Pulmo histaminum use Pulmo anaphylacticus | 
              | Pulmo vulpis | 
              | Pulmonaria | 
              | Pulmonaria officinalis use Pulmonaria vulgaris | 
              | Pulmonaria vulgaris | 
              | Pulmonary Adenomatosis use Adenomatosis, Pulmonary | 
              | Pulmonary Adenomatosis, Bovine use Pneumonia, Atypical Interstitial, of Cattle | 
              | Pulmonary Adenomatosis, Ovine | 
              | Pulmonary Alveolar Proteinosis | 
              | Pulmonary Alveoli | 
              | Pulmonary Artery | 
              | Pulmonary Artery Wedge Pressure use Pulmonary Wedge Pressure | 
              | Pulmonary Aspergillosis | 
              | Pulmonary Atelectasis | 
              | Pulmonary Atresia | 
              | Pulmonary Blastoma | 
              | Pulmonary Cancer use Lung Neoplasms | 
              | Pulmonary Capillary Wedge Pressure use Pulmonary Wedge Pressure | 
              | Pulmonary Circulation | 
              | Pulmonary Coin Lesion use Solitary Pulmonary Nodule | 
              | Pulmonary Consumption use Tuberculosis, Pulmonary | 
              | Pulmonary Diffusing Capacity | 
              | Pulmonary Disease, Chronic Obstructive | 
              | Pulmonary Diseases use Lung Diseases | 
              | Pulmonary Edema | 
              | Pulmonary Elimination | 
              | Pulmonary Embolism | 
              | Pulmonary Emphysema | 
              | Pulmonary Eosinophilia | 
              | Pulmonary Fibrosis | 
              | Pulmonary Fibrosis - from Asbestos Exposure use Asbestosis | 
              | Pulmonary Function Tests use Respiratory Function Tests | 
              | Pulmonary Fungal Infections use Lung Diseases, Fungal | 
              | Pulmonary Gas Exchange | 
              | Pulmonary Heart Disease | 
              | Pulmonary Hypertension use Hypertension, Pulmonary | 
              | Pulmonary Infarction | 
              | Pulmonary Inflammation use Pneumonia | 
              | Pulmonary Infundibular Stenosis use Pulmonary Subvalvular Stenosis | 
              | Pulmonary Macrophages use Macrophages, Alveolar | 
              | Pulmonary Medicine | 
              | Pulmonary Neoplasms use Lung Neoplasms | 
              | Pulmonary Nodule, Solitary use Solitary Pulmonary Nodule | 
              | Pulmonary Phthisis use Tuberculosis, Pulmonary | 
              | Pulmonary Regurgitation use Pulmonary Valve Insufficiency | 
              | Pulmonary Sarcoidosis use Sarcoidosis, Pulmonary | 
              | Pulmonary Sclerosing Hemangioma | 
              | Pulmonary Sequestration use Bronchopulmonary Sequestration | 
              | Pulmonary Stenosis use Pulmonary Valve Stenosis | 
              | Pulmonary Stretch Receptors | 
              | Pulmonary Subvalvular Stenosis | 
              | Pulmonary Surfactant-Associated Protein A | 
              | Pulmonary Surfactant-Associated Protein B | 
              | Pulmonary Surfactant-Associated Protein C | 
              | Pulmonary Surfactant-Associated Protein D | 
              | Pulmonary Surfactant-Associated Protein SP-B use Pulmonary Surfactant-Associated Protein B | 
              | Pulmonary Surfactant-Associated Protein SP-C use Pulmonary Surfactant-Associated Protein C | 
              | Pulmonary Surfactant-Associated Proteins | 
              | Pulmonary Surfactants | 
              | Pulmonary Surgical Procedures | 
              | Pulmonary Thromboembolism use Pulmonary Embolism | 
              | Pulmonary Valve | 
              | Pulmonary Valve Atresia use Pulmonary Atresia | 
              | Pulmonary Valve Incompetence use Pulmonary Valve Insufficiency | 
              | Pulmonary Valve Insufficiency | 
              | Pulmonary Valve Stenosis | 
              | Pulmonary Veins | 
              | Pulmonary Veno-Occlusive Disease | 
              | Pulmonary Venous Wedge Pressure use Pulmonary Wedge Pressure | 
              | Pulmonary Ventilation | 
              | Pulmonary Wedge Pressure | 
              | Pulmonic Plague use Plague | 
              | Pulmonology use Pulmonary Medicine | 
              | Pulp and Paper Industry | 
              | Pulp Canal use Dental Pulp Cavity | 
              | Pulp Capping use Dental Pulp Capping | 
              | Pulp Capping and Pulpectomy Agents | 
              | Pulp Chamber use Dental Pulp Cavity | 
              | Pulp Gangrene use Dental Pulp Necrosis | 
              | Pulp Mummification use Dental Pulp Necrosis | 
              | Pulp Necrosis use Dental Pulp Necrosis | 
              | Pulpa Dentis use Dental Pulp | 
              | Pulpectomy | 
              | Pulpitis | 
              | Pulpotomy | 
              | Pulsatile Flow | 
              | Pulsatile Tinnitus use Tinnitus | 
              | Pulsatilla | 
              | Pulsatilla nigricans | 
              | Pulsatilla nuttalliana | 
              | Pulsatilla pratensis use Pulsatilla nigricans | 
              | Pulse | 
              | Pulse Oximetry use Oximetry | 
              | Pulse Radiolysis | 
              | Pulse Rate use Heart Rate | 
              | Pulse Therapy, Drug | 
              | Pulse Wave Analysis | 
              | Pulsed Dye Lasers use Lasers, Dye | 
              | Pulsed Radiofrequency Treatment | 
              | Pulseless Disease use Takayasu Arteritis | 
              | Pulverization use Grinding | 
              | Pulvinar | 
              | Pulvinus | 
              | Puma | 
              | Puma concolor use Puma | 
              | Puma lentivirus use Immunodeficiency Virus, Feline | 
              | Pummelo use Citrus decumana | 
              | Pummelo Tree use Citrus | 
              | Pumping Stations | 
              | Pumping, Intra-Aortic Balloon use Intra-Aortic Balloon Pumping | 
              | Pumpkins use Cucurbita | 
              | Pumps | 
              | Pumps, Heart-Assist use Heart-Assist Devices | 
              | Pumps, Infusion use Infusion Pumps | 
              | Punched-Card use Punched-Card Systems | 
              | Punched-Card Systems | 
              | Punctual Source use Point Source | 
              | Puncture Biopsy use Biopsy, Needle | 
              | Puncture Vine use Tribulus | 
              | Punctures | 
              | Punica granatum use Granatum | 
              | Punicaceae | 
              | Punishment | 
              | Punna use Calophyllum | 
              | Pupa | 
              | Pupfishes use Killifishes | 
              | Pupil | 
              | Pupil Disorders | 
              | Pupil Nurses use Students, Nursing | 
              | Pupil Reaction Absent use Pupil Disorders | 
              | Pupil, Tonic use Tonic Pupil | 
              | Pupillary Functions, Abnormal use Pupil Disorders | 
              | Pupillary Miosis use Miosis | 
              | Puppet Children use Angelman Syndrome | 
              | Puppets use Play and Playthings | 
              | Purchase, Dental Practice use Practice Valuation and Purchase | 
              | Purchase, Medical Practice use Practice Valuation and Purchase | 
              | Purchasing, Hospital | 
              | Pure Agraphia use Agraphia | 
              | Pure Alexia use Alexia, Pure | 
              | Pure Autonomic Failure | 
              | Pure Oxygen Activated Sludge use Pure Oxygen Activated Sludges | 
              | Pure Oxygen Activated Sludges | 
              | Pure Red-Cell Aplasia use Red-Cell Aplasia, Pure | 
              | Pure Water | 
              | Purgatives use Cathartics | 
              | Purgin Croton use Croton tiglium | 
              | Purification Potentiality use Analysis of Treatability | 
              | Purified Water with Added Salts | 
              | Purified Water with Salt Addition use Purified Water with Added Salts | 
              | Purine Nucleosides | 
              | Purine Nucleotides | 
              | Purine Receptors use Receptors, Purinergic | 
              | Purine-Nucleoside Phosphorylase | 
              | Purine-Pyrimidine Metabolism, Inborn Errors | 
              | Purinergic Agents | 
              | Purinergic Agonists | 
              | Purinergic Antagonists | 
              | Purinergic P1 Receptor Agonists | 
              | Purinergic P1 Receptor Antagonists | 
              | Purinergic P1 Receptors use Receptors, Purinergic P1 | 
              | Purinergic P2 Receptor Agonists | 
              | Purinergic P2 Receptor Antagonists | 
              | Purinergic P2 Receptors use Receptors, Purinergic P2 | 
              | Purinergic P2X Receptor Agonists | 
              | Purinergic P2X Receptor Antagonists | 
              | Purinergic P2Y Receptor Agonists | 
              | Purinergic P2Y Receptor Antagonists | 
              | Purinergic Receptors use Receptors, Purinergic | 
              | Purines | 
              | Purinoceptors use Receptors, Purinergic | 
              | Purinones | 
              | Purkinje Cells | 
              | Purkinje Fibers | 
              | Purkinje-Type Calcium Channels use Calcium Channels, P-Type | 
              | Puromycin | 
              | Puromycin Aminonucleoside | 
              | Purple Avens use Geum rivale | 
              | Purple Bacteria use Proteobacteria | 
              | Purple Cockle use Agrostemma githago | 
              | Purple Coneflower use Echinacea purpurea | 
              | Purple Foxglove use Digitalis purpurea | 
              | Purple Lily use Iris germanica | 
              | Purple Membrane | 
              | Purple Nonsulfur Bacteria use Rhodospirillaceae | 
              | Purple Osier use Salix purpurea | 
              | Purple Pitcher Plant use Sarracenia purpurea | 
              | Purple Sulfur Bacteria use Chromatiaceae | 
              | Purple Thorn-Apple use Datura metel | 
              | Purple Willow use Salix purpurea | 
              | Purpura | 
              | Purpura Fulminans | 
              | Purpura Fulminans (Waterhouse-Friderichsen Syndrome) use Waterhouse-Friderichsen Syndrome | 
              | Purpura Hemorrhagica use Purpura, Schoenlein-Henoch | 
              | Purpura, Hyperglobulinemic | 
              | Purpura, Nonthrombocytopenic use Purpura, Schoenlein-Henoch | 
              | Purpura, Schoenlein-Henoch | 
              | Purpura, Thrombocytopenic | 
              | Purpura, Thrombocytopenic, Autoimmune use Purpura, Thrombocytopenic, Idiopathic | 
              | Purpura, Thrombocytopenic, Idiopathic | 
              | Purpura, Thrombopenic use Purpura, Thrombocytopenic | 
              | Purpura, Thrombotic Thrombocytopenic | 
              | Purpura, Thrombotic Thrombopenic use Purpura, Thrombotic Thrombocytopenic | 
              | Purslane use Portulaca | 
              | Pursuit, Saccadic use Saccades | 
              | Pursuit, Smooth | 
              | Pus use Suppuration | 
              | Pushkarmoola use Inula | 
              | Pushkarmula use Inula | 
              | Pustulants use Irritants | 
              | Pustular Dermatosis, Subcorneal use Skin Diseases, Vesiculobullous | 
              | Pustular Psoriasis of Palms and Soles use Psoriasis | 
              | Pustulosis of Palms and Soles use Psoriasis | 
              | Pustulosis Palmaris et Plantaris use Psoriasis | 
              | Putamen | 
              | Putaminal Hemorrhage | 
              | Putrefaction use Biodegradation, Environmental | 
              | Putrescine | 
              | Puumala virus | 
              | PUVA Therapy | 
              | PVC Pipes | 
              | PVP-Iodine use Povidone-Iodine | 
              | pX Genes use Genes, pX | 
              | Pyaemia use Sepsis | 
              | Pycnodysostosis | 
              | Pycnoporus | 
              | Pyelectasis | 
              | Pyelitis | 
              | Pyelocystitis | 
              | Pyelography use Urography | 
              | Pyelonephritis | 
              | Pyelonephritis, Acute Necrotizing use Pyelonephritis | 
              | Pyelonephritis, Xanthogranulomatous | 
              | Pyemia use Sepsis | 
              | Pygathrix use Cercopithecidae | 
              | Pygeum | 
              | Pygmy Chimpanzee use Pan paniscus | 
              | Pygmy Killer Whale use Dolphins | 
              | Pygmy Right Whale use Whales | 
              | Pygmy Sperm Whale use Whales | 
              | Pyknodysostosis use Pycnodysostosis | 
              | Pyknolepsy use Epilepsy, Absence | 
              | PYLL use Potential Years of Life Lost | 
              | Pyloric Antrum | 
              | Pyloric Glands use Gastric Mucosa | 
              | Pyloric Stenosis | 
              | Pyloric Stenosis, Hypertrophic | 
              | Pylorus | 
              | Pyocins | 
              | Pyocyanine | 
              | Pyoderma | 
              | Pyoderma Gangrenosum | 
              | Pyohemia use Sepsis | 
              | Pyometra | 
              | Pyomyositis | 
              | Pyonephrosis | 
              | Pyorrhea Alveolaris use Periodontal Diseases | 
              | Pyothorax use Empyema, Pleural | 
              | Pyracantha | 
              | Pyramidal Cells | 
              | Pyramidal Tracts | 
              | Pyran Copolymer | 
              | Pyranisamine use Pyrilamine | 
              | Pyranocoumarins | 
              | Pyrans | 
              | Pyrantel | 
              | Pyrantel Embonate use Pyrantel Pamoate | 
              | Pyrantel Pamoate | 
              | Pyrantel Tartrate | 
              | Pyrara use Pyrarara | 
              | Pyrarara | 
              | Pyrazinamide | 
              | Pyrazines | 
              | Pyrazinopyrimidines use Pteridines | 
              | Pyrazoles | 
              | Pyrazolones | 
              | Pyrenes | 
              | Pyrethrins | 
              | Pyrethrum use Chrysanthemum cinerariifolium | 
              | Pyrethrum officinarum | 
              | Pyrethrum parthenium | 
              | Pyrethrum roseum | 
              | Pyrethum Daisy use Chrysanthemum cinerariifolium | 
              | Pyrexia use Fever | 
              | Pyrexial Seizure use Seizures, Febrile | 
              | Pyricarbate use Pyridinolcarbamate | 
              | Pyricularia grisea | 
              | Pyridazines | 
              | Pyridine Aldoxime Methyl Compounds use Pralidoxime Compounds | 
              | Pyridine Nucleotide Transhydrogenase use NADP Transhydrogenases | 
              | Pyridines | 
              | Pyridinium Compounds | 
              | Pyridinolcarbamate | 
              | Pyridinones use Pyridones | 
              | Pyridones | 
              | Pyridostigmine Bromide | 
              | Pyridoxal | 
              | Pyridoxal Kinase | 
              | Pyridoxal Phosphate | 
              | Pyridoxamine | 
              | Pyridoxamine Kinase use Pyridoxal Kinase | 
              | Pyridoxaminephosphate Oxidase | 
              | Pyridoxic Acid | 
              | Pyridoxine | 
              | Pyridoxine Deficiency use Vitamin B 6 Deficiency | 
              | Pyridoxine Kinase use Pyridoxal Kinase | 
              | Pyridoxinecarboxylic Acid use Pyridoxic Acid | 
              | Pyridoxinedisulfide use Pyrithioxin | 
              | Pyridoxinephosphate Oxidase use Pyridoxaminephosphate Oxidase | 
              | Pyridylcarbinol use Nicotinyl Alcohol | 
              | Pyriform Sinus | 
              | Pyrilamine | 
              | Pyrimethamine | 
              | Pyrimidine 5'-Nucleotidase use 5'-Nucleotidase | 
              | Pyrimidine Dimers | 
              | Pyrimidine Nucleosides | 
              | Pyrimidine Nucleotides | 
              | Pyrimidine Phosphorylases | 
              | Pyrimidines | 
              | Pyrimidinones | 
              | Pyrimidones use Pyrimidinones | 
              | Pyrithiamine | 
              | Pyrithioxin | 
              | Pyritinol use Pyrithioxin | 
              | Pyrobaculum | 
              | Pyrocarbonic Acid Diethyl Ester use Diethyl Pyrocarbonate | 
              | Pyrocatechols use Catechols | 
              | Pyroclastic Flow | 
              | Pyroclastic Material | 
              | Pyrococcus | 
              | Pyrococcus abyssi | 
              | Pyrococcus furiosus | 
              | Pyrococcus horikoshii | 
              | Pyrodictiaceae | 
              | Pyrodictium use Pyrodictiaceae | 
              | Pyrogallol | 
              | Pyrogenium | 
              | Pyrogens | 
              | Pyroglobulins | 
              | Pyroglutamate Aminopeptidase use Pyroglutamyl-Peptidase I | 
              | Pyroglutamate Hydrolase | 
              | Pyroglutamic Acid use Pyrrolidonecarboxylic Acid | 
              | Pyroglutamyl-Peptidase I | 
              | Pyroglyphidae | 
              | Pyrola | 
              | Pyrola maculata use Chimaphila maculata | 
              | Pyrola rotundifolia | 
              | Pyrola umbellata use Chimaphila umbellata | 
              | Pyrolaceae | 
              | Pyrolignosum Acidum | 
              | Pyrolobus use Pyrodictiaceae | 
              | Pyrolysis | 
              | Pyromania use Firesetting Behavior | 
              | Pyrones | 
              | Pyronine | 
              | Pyrophoric Materials | 
              | Pyrophosphatase, Inorganic use Inorganic Pyrophosphatase | 
              | Pyrophosphatases | 
              | Pyrophosphates use Diphosphates | 
              | Pyrophosphokinases use Diphosphotransferases | 
              | Pyrophosphoric Acids use Phosphoric Acids | 
              | Pyrophosphotransferases use Diphosphotransferases | 
              | Pyrosis use Heartburn | 
              | Pyrrolamidol use Dextromoramide | 
              | Pyrroles | 
              | Pyrrolidines | 
              | Pyrrolidinomethyltetracycline use Rolitetracycline | 
              | Pyrrolidinones | 
              | Pyrrolidonecarboxylate Peptidase use Pyroglutamyl-Peptidase I | 
              | Pyrrolidonecarboxylic Acid | 
              | Pyrrolidones use Pyrrolidinones | 
              | Pyrrolidonyl Peptidase use Pyroglutamyl-Peptidase I | 
              | Pyrroline Carboxylate Reductases | 
              | Pyrrolizidine Alkaloids | 
              | Pyrrolnitrin | 
              | Pyrroloiminoquinones | 
              | Pyrrovinyquinium use Pyrvinium Compounds | 
              | Pyrularia | 
              | Pyrus | 
              | Pyrus americanus | 
              | Pyrus cydonia use Cydonia vulgaris | 
              | Pyrus germanica use Mespillus germanica | 
              | Pyruvaldehyde | 
              | Pyruvate use Pyruvic Acid | 
              | Pyruvate Carboxylase | 
              | Pyruvate Carboxylase Deficiency Disease | 
              | Pyruvate Decarboxylase | 
              | Pyruvate Dehydrogenase (Lipoamide) | 
              | Pyruvate Dehydrogenase (Lipoamide)-Phosphatase | 
              | Pyruvate Dehydrogenase Complex | 
              | Pyruvate Dehydrogenase Complex Deficiency Disease | 
              | Pyruvate Dehydrogenase Phosphatase use Pyruvate Dehydrogenase (Lipoamide)-Phosphatase | 
              | Pyruvate Kinase | 
              | Pyruvate Metabolism, Inborn Errors | 
              | Pyruvate Oxidase | 
              | Pyruvate Synthase | 
              | Pyruvate, Orthophosphate Dikinase | 
              | Pyruvate, Phosphate Dikinase use Pyruvate, Orthophosphate Dikinase | 
              | Pyruvates | 
              | Pyruvic Acid | 
              | Pyruvic Decarboxylase use Pyruvate Decarboxylase | 
              | Pyrvinium Compounds | 
              | Pythiosis | 
              | Pythium | 
              | Python use Boidae | 
              | Pyuria | 
              | PYY Peptide use Peptide YY |