DeCS 
    2008 - March 17, 2008 version
    
       
        |  Alphabetic 
          Index of Descriptors   
           
 | 
      
        |  | 
 | R Factors | 
| R Plasmids use R Factors | 
| R Repetitive Sequence use Terminal Repeat Sequences | 
| R+D use Scientific Research and Technological Development | 
| R-SNARE Proteins | 
| R-Type Calcium Channels use Calcium Channels, R-Type | 
| RAEB use Anemia, Refractory, with Excess of Blasts | 
| RAEM use Anemia, Refractory, with Excess of Blasts | 
| RAG-1 Genes use Genes, RAG-1 | 
| RAIDD Signaling Adaptor Protein use CRADD Signaling Adaptor Protein | 
| RANK Ligand | 
| RANTES use Chemokine CCL5 | 
| RAPD Technique use Random Amplified Polymorphic DNA Technique | 
| RAPD-PCR use Random Amplified Polymorphic DNA Technique | 
| RAS use Simplified Sewerage | 
| RDA use Nutrition Policy | 
| REM Sleep Behavior Disorder | 
| REM Sleep Deprivation use Sleep Deprivation | 
| REM Sleep Parasomnias | 
| REM Sleep-Related Sinus Arrest use REM Sleep Parasomnias | 
| REPIDISCA use Pan American Center for Sanitary Engineering and Environmental Sciences | 
| RFLP use Polymorphism, Restriction Fragment Length | 
| RGS Proteins | 
| RICYT use Network on Science and Technology Indicators - Ibero-American and Inter-American | 
| RING Finger Domains | 
| RING Finger Motifs use RING Finger Domains | 
| RIP Serine-Threonine Kinases use Receptor-Interacting Protein Serine-Threonine Kinases | 
| RNA | 
| RNA 3' End Processing | 
| RNA 3' Polyadenylation Signals | 
| RNA 5' Terminal Oligopyrimidine Sequence | 
| RNA Amplification Techniques use Nucleic Acid Amplification Techniques | 
| RNA Aptamers use Aptamers, Nucleotide | 
| RNA Cap Analogs | 
| RNA Cap-Binding Proteins | 
| RNA Caps | 
| RNA Computers use Computers, Molecular | 
| RNA Databases use Databases, Nucleic Acid | 
| RNA Decay use RNA Stability | 
| RNA Denaturation use Nucleic Acid Denaturation | 
| RNA Editing | 
| RNA Helicases | 
| RNA Interference | 
| RNA Ligase (ATP) | 
| RNA Methylases use tRNA Methyltransferases | 
| RNA N-Glycosidase use Ribosome Inactivating Proteins | 
| RNA Nucleotidyltransferases | 
| RNA Phages | 
| RNA Polymerase I | 
| RNA Polymerase II | 
| RNA Polymerase III | 
| RNA Polymerase Sigma 54 | 
| RNA Polymerases use DNA-Directed RNA Polymerases | 
| RNA Precursors | 
| RNA Probes | 
| RNA Processing, Post-Transcriptional | 
| RNA Regulatory Sequences use Regulatory Sequences, Ribonucleic Acid | 
| RNA Replicase | 
| RNA Rodent Viruses use RNA Viruses | 
| RNA Sequence use Base Sequence | 
| RNA Sequence Analysis use Sequence Analysis, RNA | 
| RNA Splice Sites | 
| RNA Splicing | 
| RNA Splicing, Alternative use Alternative Splicing | 
| RNA Stability | 
| RNA Synthesis Inhibitors use Nucleic Acid Synthesis Inhibitors | 
| RNA Transport | 
| RNA Tumor Viruses use Retroviridae | 
| RNA Virus Infections | 
| RNA Viruses | 
| RNA trans-Splicing use Trans-Splicing | 
| RNA, Algal | 
| RNA, Antisense | 
| RNA, Archaeal | 
| RNA, Bacterial | 
| RNA, Catalytic | 
| RNA, Chloroplast | 
| RNA, Chromosomal use RNA, Nuclear | 
| RNA, Complementary | 
| RNA, Double-Stranded | 
| RNA, Fungal | 
| RNA, Guide | 
| RNA, Helminth | 
| RNA, Heterogeneous Nuclear | 
| RNA, Messenger | 
| RNA, Messenger, Editing use RNA Editing | 
| RNA, Messenger, Masked use RNA, Messenger, Stored | 
| RNA, Messenger, Maternal use RNA, Messenger, Stored | 
| RNA, Messenger, Paternal use RNA, Messenger, Stored | 
| RNA, Messenger, Polyadenylated use RNA, Messenger | 
| RNA, Messenger, Precursors use RNA Precursors | 
| RNA, Messenger, Splicing use RNA Splicing | 
| RNA, Messenger, Stored | 
| RNA, Neoplasm | 
| RNA, Non-Polyadenylated use RNA | 
| RNA, Nuclear | 
| RNA, Piwi-Interacting use RNA, Small Interfering | 
| RNA, Plant | 
| RNA, Polyadenylated use RNA, Messenger | 
| RNA, Protozoan | 
| RNA, Ribosomal | 
| RNA, Ribosomal, 16S | 
| RNA, Ribosomal, 18S | 
| RNA, Ribosomal, 23S | 
| RNA, Ribosomal, 28S | 
| RNA, Ribosomal, 5.8S | 
| RNA, Ribosomal, 5S | 
| RNA, Ribosomal, Precursors use RNA Precursors | 
| RNA, Ribosomal, Self-Splicing | 
| RNA, Satellite | 
| RNA, Scan use RNA, Small Interfering | 
| RNA, Small Cytoplasmic | 
| RNA, Small Interfering | 
| RNA, Small Nuclear | 
| RNA, Small Nuclear, Precursors use RNA Precursors | 
| RNA, Small Nucleolar | 
| RNA, Small Temporal use MicroRNAs | 
| RNA, Spliced Leader | 
| RNA, Transfer | 
| RNA, Transfer, Ala | 
| RNA, Transfer, Amino Acid-Specific | 
| RNA, Transfer, Amino Acyl | 
| RNA, Transfer, Arg | 
| RNA, Transfer, Asn | 
| RNA, Transfer, Asp | 
| RNA, Transfer, Cys | 
| RNA, Transfer, Gln | 
| RNA, Transfer, Glu | 
| RNA, Transfer, Gly | 
| RNA, Transfer, His | 
| RNA, Transfer, Ile | 
| RNA, Transfer, Initiator use RNA, Transfer, Met | 
| RNA, Transfer, Leu | 
| RNA, Transfer, Lys | 
| RNA, Transfer, Met | 
| RNA, Transfer, Methyltransferases use tRNA Methyltransferases | 
| RNA, Transfer, Phe | 
| RNA, Transfer, Precursors use RNA Precursors | 
| RNA, Transfer, Pro | 
| RNA, Transfer, Ser | 
| RNA, Transfer, Thr | 
| RNA, Transfer, Trp | 
| RNA, Transfer, Tyr | 
| RNA, Transfer, Val | 
| RNA, Untranslated | 
| RNA, Viral | 
| RNA-Binding Protein EWS | 
| RNA-Binding Protein FUS | 
| RNA-Binding Proteins | 
| RNA-Dependent DNA Polymerase use RNA-Directed DNA Polymerase | 
| RNA-Dependent Protein Kinase use eIF-2 Kinase | 
| RNA-Dependent RNA Polymerase use RNA Replicase | 
| RNA-Directed DNA Polymerase | 
| RNA-Induced Silencing Complex | 
| RNase use Ribonucleases | 
| RNase A use Ribonuclease, Pancreatic | 
| RNase H use Ribonuclease H | 
| RNase T1 use Ribonuclease T1 | 
| ROC Analysis use ROC Curve | 
| ROC Curve | 
| RSH Syndrome use Smith-Lemli-Opitz Syndrome | 
| RSV Vaccines use Respiratory Syncytial Virus Vaccines | 
| RT-PCR use Reverse Transcriptase Polymerase Chain Reaction | 
| Rabbit Aorta Contracting Substance use Thromboxane A2 | 
| Rabbit coronavirus use Coronavirus | 
| Rabbit fibroma virus use Fibroma Virus, Rabbit | 
| Rabbit hemorrhagic disease virus use Hemorrhagic Disease Virus, Rabbit | 
| Rabbit, Domestic use Rabbits | 
| Rabbitpox virus use Vaccinia virus | 
| Rabbits | 
| Rabdosia | 
| Rabies | 
| Rabies Vaccines | 
| Rabies virus | 
| Raccoon Dogs | 
| Raccoon parvovirus use Parvovirus | 
| Raccoons | 
| Race Relations | 
| Race and Health use Ethnic Group and Health | 
| Race or Color Distribution use Race or Ethnic Group Distribution | 
| Race or Ethnic Group Distribution | 
| Racemases use Racemases and Epimerases | 
| Racemases and Epimerases | 
| Racemomycins use Streptothricins | 
| Rachischisis use Spinal Dysraphism | 
| Rachitis use Rickets | 
| Racism use Prejudice | 
| Raclopride | 
| Racquet Sports | 
| Racquetball use Racquet Sports | 
| Rad51 Recombinase | 
| Rad52 DNA Repair and Recombination Protein | 
| RadLV use Radiation Leukemia Virus | 
| Radar | 
| Radial Artery | 
| Radial Circulation Filters use Radial Filters | 
| Radial Filters | 
| Radial Keratotomy use Keratotomy, Radial | 
| Radial Nerve | 
| Radial Neuropathy | 
| Radiant Warmers, Infant use Incubators, Infant | 
| Radiation | 
| Radiation Accidents use Accidents, Radiation | 
| Radiation Biology use Radiobiology | 
| Radiation Chimera | 
| Radiation Control | 
| Radiation Diseases | 
| Radiation Dosage | 
| Radiation Dosimetry use Radiometry | 
| Radiation Effects | 
| Radiation Exposure | 
| Radiation Exposure Measure | 
| Radiation Exposure Pathways | 
| Radiation Genetics | 
| Radiation Hybrid Mapping | 
| Radiation Hybrid Maps use Radiation Hybrid Mapping | 
| Radiation Hybrids use Radiation Hybrid Mapping | 
| Radiation Injuries | 
| Radiation Injuries, Experimental | 
| Radiation Leukemia Virus | 
| Radiation Measurement | 
| Radiation Monitoring | 
| Radiation Oncology | 
| Radiation Pneumonitis | 
| Radiation Protection | 
| Radiation Recall Dermatitis use Radiodermatitis | 
| Radiation Risks | 
| Radiation Safety Guidelines use Guidelines for Radiological Safety | 
| Radiation Safety Manual use Guidelines for Radiological Safety | 
| Radiation Safety Standards use Guidelines for Radiological Safety | 
| Radiation Sensitivity use Radiation Tolerance | 
| Radiation Shielding use Shielding against Radiation | 
| Radiation Sickness use Radiation Injuries | 
| Radiation Sources | 
| Radiation Syndrome use Radiation Injuries | 
| Radiation Therapy, Computer-Assisted use Radiotherapy, Computer-Assisted | 
| Radiation Tolerance | 
| Radiation, Ionizing | 
| Radiation, Nonionizing | 
| Radiation, Visible use Light | 
| Radiation, Whole-Body use Whole-Body Irradiation | 
| Radiation-Induced Cancer use Neoplasms, Radiation-Induced | 
| Radiation-Induced Dermatitis use Radiodermatitis | 
| Radiation-Protective Agents | 
| Radiation-Sensitizing Agents | 
| Radical Neck Dissection use Neck Dissection | 
| Radicular Cyst | 
| Radiculitis use Radiculopathy | 
| Radiculopathy | 
| Radiesthesia | 
| Radio | 
| Radio Waves | 
| Radioactive Accidents and Events | 
| Radioactive Air Pollutants use Air Pollutants, Radioactive | 
| Radioactive Confinement | 
| Radioactive Decontamination | 
| Radioactive Effluents | 
| Radioactive Elements use Elements, Radioactive | 
| Radioactive Emission | 
| Radioactive Fallout | 
| Radioactive Half-Life use Half-Life | 
| Radioactive Isotopes use Radioisotopes | 
| Radioactive Material | 
| Radioactive Pollutants | 
| Radioactive Pollution | 
| Radioactive Rain use Radioactive Fallout | 
| Radioactive Substances, Products and Materials | 
| Radioactive Tracers | 
| Radioactive Waste | 
| Radioactivity | 
| Radioallergosorbent Test | 
| Radioautography use Autoradiography | 
| Radiobiology | 
| Radiocarpal Joint use Wrist Joint | 
| Radiochemistry | 
| Radiocinematography use Cineradiography | 
| Radiodermatitis | 
| Radiographic Film use X-Ray Film | 
| Radiographic Image Enhancement | 
| Radiographic Image Interpretation, Computer-Assisted | 
| Radiographic Intensifying Screens use X-Ray Intensifying Screens | 
| Radiographic Magnification | 
| Radiographic Phantoms use Phantoms, Imaging | 
| Radiography | 
| Radiography, Abdominal | 
| Radiography, Bitewing | 
| Radiography, Dental | 
| Radiography, Dental, Digital | 
| Radiography, Dual-Energy Scanned Projection | 
| Radiography, Insufflation use Pneumoradiography | 
| Radiography, Interventional | 
| Radiography, Panoramic | 
| Radiography, Thoracic | 
| Radioimmunoassay | 
| Radioimmunoconjugates use Immunoconjugates | 
| Radioimmunodetection | 
| Radioimmunoimaging use Radioimmunodetection | 
| Radioimmunoprecipitation Analysis use Radioimmunoprecipitation Assay | 
| Radioimmunoprecipitation Assay | 
| Radioimmunoscintigraphy use Radioimmunodetection | 
| Radioimmunosorbent Assay of Allergens use Radioallergosorbent Test | 
| Radioimmunosorbent Test | 
| Radioimmunotherapy | 
| Radioisotope Angiography use Radionuclide Angiography | 
| Radioisotope Brachytherapy use Brachytherapy | 
| Radioisotope Dilution Technique | 
| Radioisotope Generators use Radionuclide Generators | 
| Radioisotope Renography | 
| Radioisotope Scanning use Radionuclide Imaging | 
| Radioisotope Teletherapy | 
| Radioisotopes | 
| Radioligand Assay | 
| Radiologic Health | 
| Radiologic Phantoms use Phantoms, Imaging | 
| Radiologic Physics use Health Physics | 
| Radiologic Protection use Radiation Protection | 
| Radiologic Surveillance use Radiological Surveillance | 
| Radiological Safety Guidelines use Guidelines for Radiological Safety | 
| Radiological Safety Manual use Guidelines for Radiological Safety | 
| Radiological Safety Standards use Guidelines for Radiological Safety | 
| Radiological Surveillance | 
| Radiology | 
| Radiology Department, Hospital | 
| Radiology Information Systems | 
| Radiology, Diagnostic X-Ray use Radiography | 
| Radiology, Interventional | 
| Radiology, Therapeutic use Radiation Oncology | 
| Radiometry | 
| Radionuclide | 
| Radionuclide Angiography | 
| Radionuclide Angiography, First-Pass use Ventriculography, First-Pass | 
| Radionuclide Angiography, Gated use Gated Blood-Pool Imaging | 
| Radionuclide Generators | 
| Radionuclide Imaging | 
| Radionuclide Maximum Acceptable Concentration | 
| Radionuclide Tomography, Computed use Tomography, Emission-Computed | 
| Radionuclide Tomography, Single-Photon Emission-Computed use Tomography, Emission-Computed, Single-Photon | 
| Radionuclide Ventriculography | 
| Radionuclide Ventriculography, First-Pass use Ventriculography, First-Pass | 
| Radionuclide Ventriculography, Gated use Gated Blood-Pool Imaging | 
| Radionuclides use Radioisotopes | 
| Radiopaque Media use Contrast Media | 
| Radiopharmaceuticals | 
| Radioprotective Agents use Radiation-Protective Agents | 
| Radioreceptor Assay use Radioligand Assay | 
| Radioselenomethionine use Selenomethionine | 
| Radiosensitivity use Radiation Tolerance | 
| Radiosensitizing Agents use Radiation-Sensitizing Agents | 
| Radiosurgery | 
| Radiotherapy | 
| Radiotherapy Dosage | 
| Radiotherapy Dose Fractionation use Dose Fractionation | 
| Radiotherapy Planning, Computer-Assisted | 
| Radiotherapy, Adjuvant | 
| Radiotherapy, Computer-Assisted | 
| Radiotherapy, Conformal | 
| Radiotherapy, High-Energy | 
| Radiotherapy, Intensity-Modulated | 
| Radiotherapy, Interstitial use Brachytherapy | 
| Radiotherapy, Intracavity use Brachytherapy | 
| Radiotherapy, Lymphatic use Lymphatic Irradiation | 
| Radiotherapy, Surface use Brachytherapy | 
| Radiotherapy, Targeted use Radiotherapy | 
| Radish use Raphanus | 
| Radium | 
| Radium Bromatum | 
| Radium Metallicum | 
| Radius | 
| Radius Fractures | 
| Radon | 
| Radon Daughters | 
| Raeder Paratrigeminal Syndrome use Trigeminal Nerve Diseases | 
| Raffinose | 
| Rafoxanide | 
| Rage | 
| Ragweed use Ambrosia | 
| Ragwort use Senecio | 
| Rahnella | 
| Rahnella aquatilis use Rahnella | 
| Raillietina use Cestoda | 
| Raillietiniasis use Cestode Infections | 
| Railroads | 
| Rain | 
| Rain Induction use Mist Catchment | 
| Rain Measurement | 
| Rain Stimulation use Mist Catchment | 
| Rain, Acid use Acid Rain | 
| Rain-Gauge use Precipitation Gauge | 
| Rainfall use Atmospheric Precipitation | 
| Rainfall Amount use Pluviometry | 
| Rainfall Intensity use Precipitation Intensity | 
| Rainfall-Runoff Relationship | 
| Rainwater | 
| Rainwater Catchment | 
| Rainy Season | 
| Raising of Poultry use Aviculture | 
| Raisins use Vitis | 
| Raja use Skates (Fish) | 
| Rajania subsamarata | 
| Rajidae use Skates (Fish) | 
| Rajiformes use Skates (Fish) | 
| Raleigh Waves use Surface Waves | 
| Rales use Respiratory Sounds | 
| Raloxifene | 
| Ralstonia | 
| Ralstonia eutropha use Cupriavidus necator | 
| Ralstonia pickettii | 
| Ralstonia solanacearum | 
| Raman Spectroscopy use Spectrum Analysis, Raman | 
| Ramie use Boehmeria | 
| Ramipril | 
| Ramps use Architectural Accessibility | 
| Ramsay Hunt Auricular Syndrome use Herpes Zoster Oticus | 
| Ramsay Hunt Cerebellar Syndrome use Myoclonic Cerebellar Dyssynergia | 
| Ramsay Hunt Paralysis Syndrome use Parkinsonian Disorders | 
| Rana use Ranidae | 
| Rana bufo use Bufo rana | 
| Rana catesbeiana | 
| Rana esculenta | 
| Rana pipiens | 
| Rana ridibunda | 
| Rana temporaria | 
| Ranavirus | 
| Randia use Rubiaceae | 
| Random Allocation | 
| Random Amplified Polymorphic DNA Technique | 
| Random Peptide Library use Peptide Library | 
| Random and Systematic Sampling | 
| Randomization use Random Allocation | 
| Randomized Controlled Clinical Trial use Randomized Controlled Trial | 
| Randomized Controlled Trial | 
| Randomized Controlled Trials as Topic | 
| Range of Motion, Articular | 
| Ranid herpesvirus 1 use Herpesvirus 1, Ranid | 
| Ranidae | 
| Ranitidine | 
| Rank-Sum Tests use Statistics, Nonparametric | 
| Ranula | 
| Ranunculaceae | 
| Ranunculus | 
| Ranunculus acris | 
| Ranunculus bulbosus | 
| Ranunculus ficaria | 
| Ranunculus flammula | 
| Ranunculus glacialis | 
| Ranunculus repens | 
| Ranunculus sceleratus | 
| Ranvier's Nodes | 
| Rapadura | 
| Rapamycin use Sirolimus | 
| Rapamycin Binding Proteins use Tacrolimus Binding Proteins | 
| Rapanea use Myrsinaceae | 
| Rape | 
| Rapeseed use Brassica rapa | 
| Raphanistrum arvense | 
| Raphanus | 
| Raphanus sativus | 
| Raphe Nuclei | 
| Rapid Evaluation | 
| Rapid Eye Movement Sleep Behavior Disorder use REM Sleep Behavior Disorder | 
| Rapid Eye Movement Sleep Parasomnias use REM Sleep Parasomnias | 
| Rapid Eye Movements use Sleep, REM | 
| Rapid Filters | 
| Rapid Filtration | 
| Rapid Mix | 
| Rappel Descent | 
| Raptors | 
| Rare Books | 
| Rare Diseases | 
| Rare Earth Metals use Metals, Rare Earth | 
| Rare Gases use Noble Gases | 
| Rash use Exanthema | 
| Rasmussen Syndrome use Encephalitis | 
| Rat Cytomegalovirus use Muromegalovirus | 
| Rat Kangaroo use Potoroidae | 
| Rat Nematode use Nippostrongylus | 
| Rat Tapeworm use Hymenolepis diminuta | 
| Rat coronavirus use Coronavirus, Rat | 
| Rat encephalomyelitis virus use Theilovirus | 
| Rat virus use Parvovirus | 
| Rat-Bite Fever | 
| Ratanhia peruviana | 
| Ratany use Krameriaceae | 
| Rate Setting and Review | 
| Rates, Ratios and Proportions | 
| Rathke Cleft Cysts use Central Nervous System Cysts | 
| Rathke Pouch Tumor use Craniopharyngioma | 
| Ratibida | 
| Ratification | 
| Rational-Emotive Psychotherapy use Psychotherapy, Rational-Emotive | 
| Rationalization | 
| Rationing, Health Care use Health Care Rationing | 
| Ratites use Palaeognathae | 
| Rats | 
| Rats, Athymic use Rats, Nude | 
| Rats, Bandicoot use Murinae | 
| Rats, Brattleboro | 
| Rats, Cotton use Sigmodontinae | 
| Rats, Gunn | 
| Rats, Hairless | 
| Rats, Holtzman use Rats, Sprague-Dawley | 
| Rats, Inbred A x C 9935 Irish use Rats, Inbred ACI | 
| Rats, Inbred ACI | 
| Rats, Inbred BB | 
| Rats, Inbred BN | 
| Rats, Inbred BUF | 
| Rats, Inbred Brown Norway use Rats, Inbred BN | 
| Rats, Inbred Buffalo use Rats, Inbred BUF | 
| Rats, Inbred CDF use Rats, Inbred F344 | 
| Rats, Inbred Dahl | 
| Rats, Inbred F344 | 
| Rats, Inbred Fischer 344 use Rats, Inbred F344 | 
| Rats, Inbred LEC | 
| Rats, Inbred Lew | 
| Rats, Inbred Lewis use Rats, Inbred Lew | 
| Rats, Inbred Long-Evans Cinnamon use Rats, Inbred LEC | 
| Rats, Inbred OLETF | 
| Rats, Inbred SHR | 
| Rats, Inbred Strains | 
| Rats, Inbred WF | 
| Rats, Inbred WKY | 
| Rats, Inbred Wistar Furth use Rats, Inbred WF | 
| Rats, Kangaroo use Dipodomys | 
| Rats, Long-Evans | 
| Rats, Mutant Strains | 
| Rats, Nude | 
| Rats, Rice use Sigmodontinae | 
| Rats, Sand use Gerbillinae | 
| Rats, Spontaneously Hypertensive use Rats, Inbred SHR | 
| Rats, Sprague-Dawley | 
| Rats, Wistar | 
| Rats, Wistar Furth use Rats, Inbred WF | 
| Rats, Wistar Kyoto use Rats, Inbred WKY | 
| Rats, Zucker | 
| Rattlepod Chipilin use Crotalaria | 
| Rattlesnake use Crotalus | 
| Rattlesnake Venoms use Crotalid Venoms | 
| Rattus use Rats | 
| Raulinoa use Rutaceae | 
| Rauscher Spleen Focus-Forming Virus use Spleen Focus-Forming Viruses | 
| Rauscher Virus | 
| Rauwolfia | 
| Rauwolfia serpentina | 
| Rauwolscine use Yohimbine | 
| Ravens use Crows | 
| Raw Effluents | 
| Raw Water | 
| Raynaud Disease | 
| Rays (Fish) use Skates (Fish) | 
| Razoxane | 
| Rb Genes use Genes, Retinoblastoma | 
| Rb Protein use Retinoblastoma Protein | 
| Reactants, Acute-Phase use Acute-Phase Proteins | 
| Reaction Time | 
| Reaction, Acute-Phase use Acute-Phase Reaction | 
| Reactive Attachment Disorder | 
| Reactive Disorders use Adjustment Disorders | 
| Reactive Hemophagocytic Syndrome use Lymphohistiocytosis, Hemophagocytic | 
| Reactive Inhibition | 
| Reactive Nitrogen Species | 
| Reactive Oxygen Species | 
| Reactive Site use Binding Sites | 
| Reactivity-Stability | 
| Readability use Comprehension | 
| Readiness Potential use Contingent Negative Variation | 
| Reading | 
| Reading Disability, Acquired use Dyslexia, Acquired | 
| Reading Disability, Developmental use Dyslexia | 
| Reading Disorder use Dyslexia | 
| Reading Disorder, Developmental use Dyslexia | 
| Reading Frames | 
| Reagent Kits, Diagnostic | 
| Reagent Strips | 
| Reagent Substances, Products and Materials | 
| Reagents use Indicators and Reagents | 
| Reagins | 
| Real-Time Systems use Computer Systems | 
| Reality Testing | 
| Reality Therapy | 
| Reassortant Viruses | 
| Reaven Syndrome X use Metabolic Syndrome X | 
| Rec A Protein use Rec A Recombinases | 
| Rec A Recombinases | 
| RecQ Helicases | 
| Recall use Mental Recall | 
| Receiver Operating Characteristic use ROC Curve | 
| Receptive Aphasia use Aphasia, Wernicke | 
| Receptor Activator of Nuclear Factor-kappa B | 
| Receptor Aggregation | 
| Receptor Cross-Talk | 
| Receptor Down-Regulation use Down-Regulation | 
| Receptor Protein-Tyrosine Kinases | 
| Receptor Up-Regulation use Up-Regulation | 
| Receptor, Adenosine A1 | 
| Receptor, Adenosine A2A | 
| Receptor, Adenosine A2B | 
| Receptor, Adenosine A3 | 
| Receptor, Anaphylatoxin C5a | 
| Receptor, Angiotensin II Type 2 use Receptor, Angiotensin, Type 2 | 
| Receptor, Angiotensin, Type 1 | 
| Receptor, Angiotensin, Type 1a use Receptor, Angiotensin, Type 1 | 
| Receptor, Angiotensin, Type 1b use Receptor, Angiotensin, Type 1 | 
| Receptor, Angiotensin, Type 2 | 
| Receptor, Apolipoprotein E use LDL-Receptor Related Protein 1 | 
| Receptor, Bradykinin B1 | 
| Receptor, Bradykinin B2 | 
| Receptor, CSF-1 use Receptor, Macrophage Colony-Stimulating Factor | 
| Receptor, Cannabinoid, CB1 | 
| Receptor, Cannabinoid, CB2 | 
| Receptor, Cholecystokinin A | 
| Receptor, Cholecystokinin B | 
| Receptor, Ciliary Neurotrophic Factor | 
| Receptor, Complement 3 use Macrophage-1 Antigen | 
| Receptor, Complement 5a use Receptor, Anaphylatoxin C5a | 
| Receptor, EGF use Receptor, Epidermal Growth Factor | 
| Receptor, Endothelin A | 
| Receptor, Endothelin B | 
| Receptor, Endothelin B, Type 2 use Receptor, Endothelin B | 
| Receptor, EphA1 | 
| Receptor, EphA2 | 
| Receptor, EphA3 | 
| Receptor, EphA4 | 
| Receptor, EphA5 | 
| Receptor, EphA6 | 
| Receptor, EphA7 | 
| Receptor, EphA8 | 
| Receptor, EphB1 | 
| Receptor, EphB2 | 
| Receptor, EphB3 | 
| Receptor, EphB4 | 
| Receptor, EphB5 | 
| Receptor, EphB6 | 
| Receptor, Epidermal Growth Factor | 
| Receptor, Fibroblast Growth Factor, Type 1 | 
| Receptor, Fibroblast Growth Factor, Type 2 | 
| Receptor, Fibroblast Growth Factor, Type 3 | 
| Receptor, Fibroblast Growth Factor, Type 4 | 
| Receptor, Fibroblast Growth Factor, Type 5 | 
| Receptor, Galanin, Type 1 | 
| Receptor, Galanin, Type 2 | 
| Receptor, Galanin, Type 3 | 
| Receptor, IGF Type 1 | 
| Receptor, IGF Type 2 | 
| Receptor, IGF-I use Receptor, IGF Type 1 | 
| Receptor, IGF-II use Receptor, IGF Type 2 | 
| Receptor, Insulin | 
| Receptor, Insulin-Like Growth Factor I use Receptor, IGF Type 1 | 
| Receptor, Insulin-Like Growth Factor II use Receptor, IGF Type 2 | 
| Receptor, Insulin-Like Growth Factor Type 1 use Receptor, IGF Type 1 | 
| Receptor, Insulin-Like Growth Factor Type 2 use Receptor, IGF Type 2 | 
| Receptor, Interferon alpha-beta | 
| Receptor, Interleukin-13 alpha2 use Interleukin-13 Receptor alpha2 Subunit | 
| Receptor, Interleukin-4, 13 use Receptors, Interleukin-4, Type II | 
| Receptor, Macrophage Colony-Stimulating Factor | 
| Receptor, Mannose-6-Phosphate use Receptor, IGF Type 2 | 
| Receptor, Melanocortin, Type 1 | 
| Receptor, Melanocortin, Type 2 | 
| Receptor, Melanocortin, Type 3 | 
| Receptor, Melanocortin, Type 4 | 
| Receptor, Melatonin, MT1 | 
| Receptor, Melatonin, MT2 | 
| Receptor, Muscarinic M1 | 
| Receptor, Muscarinic M2 | 
| Receptor, Muscarinic M3 | 
| Receptor, Muscarinic M4 | 
| Receptor, Muscarinic M5 | 
| Receptor, Nerve Growth Factor | 
| Receptor, Neurotrophic Tyrosine Kinase Type 1 use Receptor, trkA | 
| Receptor, Neurotrophic Tyrosine-Kinase Type 2 use Receptor, trkB | 
| Receptor, Neurotrophic-Tyrosine-Kinase Type 3 use Receptor, trkC | 
| Receptor, Notch1 | 
| Receptor, Notch2 | 
| Receptor, PAR-1 | 
| Receptor, PAR-2 | 
| Receptor, PDGF alpha use Receptor, Platelet-Derived Growth Factor alpha | 
| Receptor, PDGF beta use Receptor, Platelet-Derived Growth Factor beta | 
| Receptor, Parathyroid Hormone, Type 1 | 
| Receptor, Parathyroid Hormone, Type 2 | 
| Receptor, Platelet-Derived Growth Factor alpha | 
| Receptor, Platelet-Derived Growth Factor beta | 
| Receptor, Serotonin, 5-HT1A | 
| Receptor, Serotonin, 5-HT1B | 
| Receptor, Serotonin, 5-HT1D | 
| Receptor, Serotonin, 5-HT2A | 
| Receptor, Serotonin, 5-HT2B | 
| Receptor, Serotonin, 5-HT2C | 
| Receptor, Stem Cell Factor use Proto-Oncogene Proteins c-kit | 
| Receptor, TGF-alpha use Receptor, Epidermal Growth Factor | 
| Receptor, TIE-1 | 
| Receptor, TIE-2 | 
| Receptor, Transforming-Growth Factor alpha use Receptor, Epidermal Growth Factor | 
| Receptor, Urogastrone use Receptor, Epidermal Growth Factor | 
| Receptor, alpha-2 Macroglobulin use LDL-Receptor Related Protein 1 | 
| Receptor, erbB-2 | 
| Receptor, erbB-3 | 
| Receptor, neu use Receptor, erbB-2 | 
| Receptor, trkA | 
| Receptor, trkB | 
| Receptor, trkC | 
| Receptor-CD3 Complex, Antigen, T-Cell | 
| Receptor-Interacting Protein Serine-Threonine Kinase 2 | 
| Receptor-Interacting Protein Serine-Threonine Kinases | 
| Receptor-Like Protein Tyrosine Phosphatases | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 1 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 2A use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 2B use Receptor-Like Protein Tyrosine Phosphatases, Class 2 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 3 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 4 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 5 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 6 use Receptor-Like Protein Tyrosine Phosphatases, Class 1 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 7 | 
| Receptor-Like Protein Tyrosine Phosphatases, Class 8 | 
| Receptor-Mediated Signal Transduction use Signal Transduction | 
| Receptor-Regulated Smad Proteins use Smad Proteins, Receptor-Regulated | 
| Receptors alpha, Thyroid Hormone use Thyroid Hormone Receptors alpha | 
| Receptors beta, Thyroid Hormone use Thyroid Hormone Receptors beta | 
| Receptors, ACTH use Receptors, Corticotropin | 
| Receptors, ADP use Receptors, Purinergic P2 | 
| Receptors, AH use Receptors, Aryl Hydrocarbon | 
| Receptors, AMPA | 
| Receptors, ANF use Receptors, Atrial Natriuretic Factor | 
| Receptors, ATP use Receptors, Purinergic P2 | 
| Receptors, Acetylcholine use Receptors, Cholinergic | 
| Receptors, Adenosine use Receptors, Purinergic P1 | 
| Receptors, Adenosine A2 | 
| Receptors, Adipokine | 
| Receptors, Adiponectin | 
| Receptors, Adrenergic | 
| Receptors, Adrenergic, alpha | 
| Receptors, Adrenergic, alpha-1 | 
| Receptors, Adrenergic, alpha-2 | 
| Receptors, Adrenergic, beta | 
| Receptors, Adrenergic, beta-1 | 
| Receptors, Adrenergic, beta-2 | 
| Receptors, Adrenergic, beta-3 | 
| Receptors, Adrenocorticotropic Hormone use Receptors, Corticotropin | 
| Receptors, Albumin | 
| Receptors, Aldosterone | 
| Receptors, Amino Acid | 
| Receptors, Androgen | 
| Receptors, Angiotensin | 
| Receptors, Antigen | 
| Receptors, Antigen, B-Cell | 
| Receptors, Antigen, T-Cell | 
| Receptors, Antigen, T-Cell, alpha-beta | 
| Receptors, Antigen, T-Cell, gamma-delta | 
| Receptors, Aryl Hydrocarbon | 
| Receptors, Atrial Natriuretic Factor | 
| Receptors, Atriopeptin use Receptors, Atrial Natriuretic Factor | 
| Receptors, Benzodiazepine use Receptors, GABA-A | 
| Receptors, Benzodiazepine-GABA use Receptors, GABA-A | 
| Receptors, Biogenic Amine | 
| Receptors, Bombesin | 
| Receptors, Bradykinin | 
| Receptors, C3b use Receptors, Complement 3b | 
| Receptors, C3d use Receptors, Complement 3d | 
| Receptors, CCK use Receptors, Cholecystokinin | 
| Receptors, CCR | 
| Receptors, CCR1 | 
| Receptors, CCR10 | 
| Receptors, CCR2 | 
| Receptors, CCR3 | 
| Receptors, CCR4 | 
| Receptors, CCR5 | 
| Receptors, CCR6 | 
| Receptors, CCR7 | 
| Receptors, CCR8 | 
| Receptors, CD4 use Antigens, CD4 | 
| Receptors, CGRP use Receptors, Calcitonin Gene-Related Peptide | 
| Receptors, CR1 use Receptors, Complement 3b | 
| Receptors, CR2 use Receptors, Complement 3d | 
| Receptors, CRH use Receptors, Corticotropin-Releasing Hormone | 
| Receptors, CXCR | 
| Receptors, CXCR1 use Receptors, Interleukin-8A | 
| Receptors, CXCR2 use Receptors, Interleukin-8B | 
| Receptors, CXCR3 | 
| Receptors, CXCR4 | 
| Receptors, CXCR5 | 
| Receptors, Caerulein use Receptors, Cholecystokinin | 
| Receptors, Calcitonin | 
| Receptors, Calcitonin Gene-Related Peptide | 
| Receptors, Calcitriol | 
| Receptors, Calcium Channel Blocker use Calcium Channels | 
| Receptors, Calcium-Sensing | 
| Receptors, Cannabinoid | 
| Receptors, Catecholamine | 
| Receptors, Cell Surface | 
| Receptors, Chemokine | 
| Receptors, Cholecystokinin | 
| Receptors, Cholinergic | 
| Receptors, Chorionic Gonadotropin use Receptors, LH | 
| Receptors, Collagen | 
| Receptors, Colony-Stimulating Factor | 
| Receptors, Complement | 
| Receptors, Complement 3b | 
| Receptors, Complement 3d | 
| Receptors, Concanavalin A | 
| Receptors, Corticosteroid use Receptors, Steroid | 
| Receptors, Corticotropin | 
| Receptors, Corticotropin-Releasing Hormone | 
| Receptors, Cyclic AMP | 
| Receptors, Cytoadhesin | 
| Receptors, Cytokine | 
| Receptors, Cytoplasmic and Nuclear | 
| Receptors, Death Domain | 
| Receptors, Diazepam use Receptors, GABA-A | 
| Receptors, Dihydropyridine use Calcium Channels, L-Type | 
| Receptors, Diiodotyrosine use Receptors, Thyroid Hormone | 
| Receptors, Dioxin use Receptors, Aryl Hydrocarbon | 
| Receptors, Dopamine | 
| Receptors, Dopamine D1 | 
| Receptors, Dopamine D2 | 
| Receptors, Dopamine D3 | 
| Receptors, Dopamine D4 | 
| Receptors, Dopamine D5 | 
| Receptors, Drug | 
| Receptors, Ectodysplasin | 
| Receptors, Edar use Edar Receptor | 
| Receptors, Eicosanoid | 
| Receptors, Endogenous Substances use Receptors, Cell Surface | 
| Receptors, Endorphin use Receptors, Opioid | 
| Receptors, Endothelin | 
| Receptors, Endothelium-Derived Vasoconstrictor Factor use Receptors, Endothelin | 
| Receptors, Enkephalin use Receptors, Opioid | 
| Receptors, Eph Family | 
| Receptors, Epidermal Growth Factor-Urogastrone use Receptor, Epidermal Growth Factor | 
| Receptors, Epinephrine use Receptors, Adrenergic | 
| Receptors, Epoprostenol | 
| Receptors, Erythropoietin | 
| Receptors, Estradiol | 
| Receptors, Estrogen | 
| Receptors, Excitatory Amino Acid use Receptors, Glutamate | 
| Receptors, Extracellular Matrix Glycoprotein use Receptors, Cytoadhesin | 
| Receptors, FGF use Receptors, Fibroblast Growth Factor | 
| Receptors, FSH | 
| Receptors, Fc | 
| Receptors, Fc epsilon use Receptors, IgE | 
| Receptors, Fc gamma use Receptors, IgG | 
| Receptors, Fibrinogen | 
| Receptors, Fibroblast Growth Factor | 
| Receptors, Fibronectin | 
| Receptors, Follicle-Stimulating Hormone use Receptors, FSH | 
| Receptors, Formyl Peptide | 
| Receptors, G-Protein-Coupled | 
| Receptors, GABA | 
| Receptors, GABA-A | 
| Receptors, GABA-B | 
| Receptors, GABA-Benzodiazepine use Receptors, GABA-A | 
| Receptors, Galanin | 
| Receptors, Gastrin use Receptor, Cholecystokinin B | 
| Receptors, Gastrin-Releasing Peptide use Receptors, Bombesin | 
| Receptors, Gastrointestinal Hormone | 
| Receptors, Gastrointestinal Peptides use Receptors, Gastrointestinal Hormone | 
| Receptors, Ghrelin | 
| Receptors, Glucagon | 
| Receptors, Glucocorticoid | 
| Receptors, Glutamate | 
| Receptors, Glutamate, Metabotropic use Receptors, Metabotropic Glutamate | 
| Receptors, Glycine | 
| Receptors, GnRH use Receptors, LHRH | 
| Receptors, Gonadoliberin use Receptors, LHRH | 
| Receptors, Gonadorelin use Receptors, LHRH | 
| Receptors, Gonadotropin | 
| Receptors, Granulocyte Colony-Stimulating Factor | 
| Receptors, Granulocyte-Macrophage Colony-Stimulating Factor | 
| Receptors, Growth Factor | 
| Receptors, Growth Hormone use Receptors, Somatotropin | 
| Receptors, Guanylate Cyclase-Coupled | 
| Receptors, HIV | 
| Receptors, Hematopoietic Growth Factors use Receptors, Colony-Stimulating Factor | 
| Receptors, Histamine | 
| Receptors, Histamine H1 | 
| Receptors, Histamine H2 | 
| Receptors, Histamine H3 | 
| Receptors, Human Chorionic Gonadotropin use Receptors, LH | 
| Receptors, Hyaluronan use Antigens, CD44 | 
| Receptors, Hypothalamic Release-Inhibiting Hormones use Receptors, Pituitary Hormone-Regulating Hormone | 
| Receptors, Hypothalamic Releasing Hormones use Receptors, Pituitary Hormone-Regulating Hormone | 
| Receptors, IL-1 use Receptors, Interleukin-1 | 
| Receptors, IL-10 use Receptors, Interleukin-10 | 
| Receptors, IL-2 use Receptors, Interleukin-2 | 
| Receptors, IL-3 use Receptors, Interleukin-3 | 
| Receptors, IL-4 use Receptors, Interleukin-4 | 
| Receptors, IL-6 use Receptors, Interleukin-6 | 
| Receptors, IL-7 use Receptors, Interleukin-7 | 
| Receptors, IL-9 use Receptors, Interleukin-9 | 
| Receptors, IgE | 
| Receptors, IgG | 
| Receptors, Imidazoline-Guanidinium use Imidazoline Receptors | 
| Receptors, Immunologic | 
| Receptors, Insulin-Like Growth Factors use Receptors, Somatomedin | 
| Receptors, Interferon | 
| Receptors, Interleukin | 
| Receptors, Interleukin Common gamma Chain use Interleukin Receptor Common gamma Subunit | 
| Receptors, Interleukin-1 | 
| Receptors, Interleukin-1 Type I | 
| Receptors, Interleukin-1 Type II | 
| Receptors, Interleukin-10 | 
| Receptors, Interleukin-11 | 
| Receptors, Interleukin-12 | 
| Receptors, Interleukin-13 | 
| Receptors, Interleukin-15 | 
| Receptors, Interleukin-16 | 
| Receptors, Interleukin-17 | 
| Receptors, Interleukin-18 | 
| Receptors, Interleukin-2 | 
| Receptors, Interleukin-21 | 
| Receptors, Interleukin-3 | 
| Receptors, Interleukin-4 | 
| Receptors, Interleukin-4, 13 use Receptors, Interleukin-4, Type II | 
| Receptors, Interleukin-4, Type I | 
| Receptors, Interleukin-4, Type II | 
| Receptors, Interleukin-5 | 
| Receptors, Interleukin-6 | 
| Receptors, Interleukin-7 | 
| Receptors, Interleukin-8 | 
| Receptors, Interleukin-8A | 
| Receptors, Interleukin-8B | 
| Receptors, Interleukin-9 | 
| Receptors, Interstitial Cell-Stimulating Hormone use Receptors, LH | 
| Receptors, Invertebrate Peptide | 
| Receptors, KIR | 
| Receptors, KIR2DL1 | 
| Receptors, KIR2DL2 | 
| Receptors, KIR2DL3 | 
| Receptors, KIR2DL4 | 
| Receptors, KIR2DL5 | 
| Receptors, KIR3DL1 | 
| Receptors, KIR3DL2 | 
| Receptors, KIR3DS1 | 
| Receptors, Kainate use Receptors, Kainic Acid | 
| Receptors, Kainic Acid | 
| Receptors, LDL | 
| Receptors, LH | 
| Receptors, LHRH | 
| Receptors, Laminin | 
| Receptors, Lectin use Receptors, Mitogen | 
| Receptors, Leptin | 
| Receptors, Leukemia Inhibitory Factor use Receptors, OSM-LIF | 
| Receptors, Leukocyte-Adhesion | 
| Receptors, Leukotriene | 
| Receptors, Leukotriene B4 | 
| Receptors, Lipopolysaccharide use Antigens, CD14 | 
| Receptors, Lipoprotein | 
| Receptors, Lipoxin | 
| Receptors, Low Density Lipoprotein use Receptors, LDL | 
| Receptors, Luliberin use Receptors, LHRH | 
| Receptors, Luteinizing Hormone use Receptors, LH | 
| Receptors, Lymphocyte Homing | 
| Receptors, Lysophosphatidic Acid | 
| Receptors, Lysophospholipid | 
| Receptors, Lysosphingolipid | 
| Receptors, Mating Factor | 
| Receptors, Melanocortin | 
| Receptors, Melatonin | 
| Receptors, Menotropin use Receptors, Gonadotropin | 
| Receptors, Metabotropic Glutamate | 
| Receptors, Mineralocorticoid | 
| Receptors, Mitogen | 
| Receptors, Morphine use Receptors, Opioid, mu | 
| Receptors, Muscarinic | 
| Receptors, Muscarinic M4 use Receptor, Muscarinic M4 | 
| Receptors, Muscimol use Receptors, GABA-A | 
| Receptors, N-Acetylglucosamine | 
| Receptors, N-Methyl-D-Aspartate | 
| Receptors, NGF use Receptors, Nerve Growth Factor | 
| Receptors, NK-2 use Receptors, Neurokinin-2 | 
| Receptors, NK-3 use Receptors, Neurokinin-3 | 
| Receptors, NMDA use Receptors, N-Methyl-D-Aspartate | 
| Receptors, Narcotic use Receptors, Opioid | 
| Receptors, Nerve Growth Factor | 
| Receptors, Neural use Receptors, Sensory | 
| Receptors, Neurohumor use Receptors, Neurotransmitter | 
| Receptors, Neurokinin-1 | 
| Receptors, Neurokinin-2 | 
| Receptors, Neurokinin-3 | 
| Receptors, Neuromedin B use Receptors, Bombesin | 
| Receptors, Neuropeptide | 
| Receptors, Neuropeptide Y | 
| Receptors, Neurotensin | 
| Receptors, Neurotransmitter | 
| Receptors, Neurotrophin use Receptors, Nerve Growth Factor | 
| Receptors, Nicotinic | 
| Receptors, Norepinephrine use Receptors, Adrenergic | 
| Receptors, Notch | 
| Receptors, OSM-LIF | 
| Receptors, OX40 | 
| Receptors, Odorant | 
| Receptors, Oncostatin M | 
| Receptors, Oncostatin M, Type II | 
| Receptors, Opiate use Receptors, Opioid | 
| Receptors, Opioid | 
| Receptors, Opioid, delta | 
| Receptors, Opioid, kappa | 
| Receptors, Opioid, mu | 
| Receptors, Opioid, sigma use Receptors, sigma | 
| Receptors, Oxidized LDL | 
| Receptors, Oxytocin | 
| Receptors, PCP use Receptors, Phencyclidine | 
| Receptors, PDGF use Receptors, Platelet-Derived Growth Factor | 
| Receptors, Pain use Nociceptors | 
| Receptors, Pancreatic Hormone | 
| Receptors, Pancreozymin use Receptors, Cholecystokinin | 
| Receptors, Parathyroid Hormone | 
| Receptors, Pattern Recognition | 
| Receptors, Peptide | 
| Receptors, Peptide, Invertebrate use Receptors, Invertebrate Peptide | 
| Receptors, Phencyclidine | 
| Receptors, Pheromone | 
| Receptors, Phospholipase A2 | 
| Receptors, Pituitary Adenylate Cyclase-Activating Peptide, Type II use Receptors, Vasoactive Intestinal Polypeptide, Type I | 
| Receptors, Pituitary Adenylate Cyclase-Activating Peptide, Type III use Receptors, Vasoactive Intestinal Peptide, Type II | 
| Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide | 
| Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I | 
| Receptors, Pituitary Hormone | 
| Receptors, Pituitary Hormone Release Inhibiting Hormones use Receptors, Pituitary Hormone-Regulating Hormone | 
| Receptors, Pituitary Hormone-Regulating Hormone | 
| Receptors, Pituitary Hormone-Releasing Hormone use Receptors, Pituitary Hormone-Regulating Hormone | 
| Receptors, Platelet-Derived Growth Factor | 
| Receptors, Polymeric Immunoglobulin | 
| Receptors, Presynaptic | 
| Receptors, Progesterone | 
| Receptors, Progestin use Receptors, Progesterone | 
| Receptors, Prolactin | 
| Receptors, Prostacyclin use Receptors, Epoprostenol | 
| Receptors, Prostaglandin | 
| Receptors, Prostaglandin E | 
| Receptors, Prostaglandin H2 use Receptors, Thromboxane A2, Prostaglandin H2 | 
| Receptors, Protein-Tyrosine Kinase use Receptor Protein-Tyrosine Kinases | 
| Receptors, Proteinase-Activated | 
| Receptors, Protirelin use Receptors, Thyrotropin-Releasing Hormone | 
| Receptors, Pulmonary Stretch use Pulmonary Stretch Receptors | 
| Receptors, Purinergic | 
| Receptors, Purinergic P1 | 
| Receptors, Purinergic P2 | 
| Receptors, Retinoic Acid | 
| Receptors, SRS-A use Receptors, Leukotriene | 
| Receptors, Scavenger | 
| Receptors, Sensory | 
| Receptors, Serotonin | 
| Receptors, Serotonin, 5-HT1 | 
| Receptors, Serotonin, 5-HT2 | 
| Receptors, Serotonin, 5-HT3 | 
| Receptors, Serotonin, 5-HT4 | 
| Receptors, Serotonin, 5-HT4L use Receptors, Serotonin, 5-HT4 | 
| Receptors, Serotonin, 5-HT4S use Receptors, Serotonin, 5-HT4 | 
| Receptors, Sincalide use Receptors, Cholecystokinin | 
| Receptors, Somatomedin | 
| Receptors, Somatostatin | 
| Receptors, Somatotropin | 
| Receptors, Somatotropin Release Inhibiting Hormone use Receptors, Somatostatin | 
| Receptors, Steroid | 
| Receptors, Stretch use Mechanoreceptors | 
| Receptors, Stretch, Arterial use Pressoreceptors | 
| Receptors, Stretch, Muscle use Muscle Spindles | 
| Receptors, Stretch, Pulmonary use Pulmonary Stretch Receptors | 
| Receptors, Stretch, Vascular use Pressoreceptors | 
| Receptors, Substance K use Receptors, Neurokinin-2 | 
| Receptors, Substance P use Receptors, Neurokinin-1 | 
| Receptors, Synaptic use Receptors, Neurotransmitter | 
| Receptors, T-Cell Growth Factor use Receptors, Interleukin-2 | 
| Receptors, TGF-beta use Receptors, Transforming Growth Factor beta | 
| Receptors, TIE | 
| Receptors, TNF-Related Apoptosis-Inducing Ligand | 
| Receptors, TRAIL use Receptors, TNF-Related Apoptosis-Inducing Ligand | 
| Receptors, TRH use Receptors, Thyrotropin-Releasing Hormone | 
| Receptors, TXA2-PGH2 use Receptors, Thromboxane A2, Prostaglandin H2 | 
| Receptors, Tachykinin | 
| Receptors, Thrombin | 
| Receptors, Thrombopoietin | 
| Receptors, Thrombospondin use Antigens, CD36 | 
| Receptors, Thromboxane | 
| Receptors, Thromboxane A2 use Receptors, Thromboxane A2, Prostaglandin H2 | 
| Receptors, Thromboxane A2, Prostaglandin H2 | 
| Receptors, Thyroid Hormone | 
| Receptors, Thyroid Stimulating Hormone use Receptors, Thyrotropin | 
| Receptors, Thyroliberin use Receptors, Thyrotropin-Releasing Hormone | 
| Receptors, Thyrotropin | 
| Receptors, Thyrotropin-Releasing Hormone | 
| Receptors, Thyroxine use Receptors, Thyroid Hormone | 
| Receptors, Toll-Like use Toll-Like Receptors | 
| Receptors, Transferrin | 
| Receptors, Transforming Growth Factor beta | 
| Receptors, Triiodothyronine use Receptors, Thyroid Hormone | 
| Receptors, Tryptamine use Receptors, Serotonin | 
| Receptors, Tumor Necrosis Factor | 
| Receptors, Tumor Necrosis Factor, Member 10 use Receptors, TNF-Related Apoptosis-Inducing Ligand | 
| Receptors, Tumor Necrosis Factor, Member 10b use Receptors, TNF-Related Apoptosis-Inducing Ligand | 
| Receptors, Tumor Necrosis Factor, Member 10c | 
| Receptors, Tumor Necrosis Factor, Member 11a use Receptor Activator of Nuclear Factor-kappa B | 
| Receptors, Tumor Necrosis Factor, Member 11b use Osteoprotegerin | 
| Receptors, Tumor Necrosis Factor, Member 14 | 
| Receptors, Tumor Necrosis Factor, Member 17 use B-Cell Maturation Antigen | 
| Receptors, Tumor Necrosis Factor, Member 18 use Glucocorticoid-Induced TNFR-Related Protein | 
| Receptors, Tumor Necrosis Factor, Member 1A use Receptors, Tumor Necrosis Factor, Type I | 
| Receptors, Tumor Necrosis Factor, Member 1B use Receptors, Tumor Necrosis Factor, Type II | 
| Receptors, Tumor Necrosis Factor, Member 25 | 
| Receptors, Tumor Necrosis Factor, Member 4 use Receptors, OX40 | 
| Receptors, Tumor Necrosis Factor, Member 6b | 
| Receptors, Tumor Necrosis Factor, Type I | 
| Receptors, Tumor Necrosis Factor, Type II | 
| Receptors, V1 use Receptors, Vasopressin | 
| Receptors, V2 use Receptors, Vasopressin | 
| Receptors, VIP use Receptors, Vasoactive Intestinal Peptide | 
| Receptors, VLA use Receptors, Very Late Antigen | 
| Receptors, VLA-5 use Integrin alpha5beta1 | 
| Receptors, Vascular Endothelial Growth Factor | 
| Receptors, Vasoactive Intestinal Peptide | 
| Receptors, Vasoactive Intestinal Peptide, Type II | 
| Receptors, Vasoactive Intestinal Polypeptide, Type I | 
| Receptors, Vasopressin | 
| Receptors, Very Late Antigen | 
| Receptors, Virus | 
| Receptors, Vitamin D use Receptors, Calcitriol | 
| Receptors, Vitronectin | 
| Receptors, alpha-1 Adrenergic use Receptors, Adrenergic, alpha-1 | 
| Receptors, alpha-2 Adrenergic use Receptors, Adrenergic, alpha-2 | 
| Receptors, alpha-Adrenergic use Receptors, Adrenergic, alpha | 
| Receptors, beta-1 Adrenergic use Receptors, Adrenergic, beta-1 | 
| Receptors, beta-2 Adrenergic use Receptors, Adrenergic, beta-2 | 
| Receptors, beta-3 Adrenergic use Receptors, Adrenergic, beta-3 | 
| Receptors, beta-Adrenergic use Receptors, Adrenergic, beta | 
| Receptors, delta use Receptors, Opioid, delta | 
| Receptors, delta Opioid use Receptors, Opioid, delta | 
| Receptors, fas use Antigens, CD95 | 
| Receptors, gamma-Aminobutyric Acid use Receptors, GABA | 
| Receptors, kappa use Receptors, Opioid, kappa | 
| Receptors, kappa Opioid use Receptors, Opioid, kappa | 
| Receptors, mu use Receptors, Opioid, mu | 
| Receptors, mu Opioid use Receptors, Opioid, mu | 
| Receptors, sigma | 
| Receptors, sigma Opioid use Receptors, sigma | 
| Receptosomes use Endosomes | 
| Rechargable Batteries use Electric Batteries | 
| Recipes use Cookery | 
| Reciprocating Tachycardia use Tachycardia, Reciprocating | 
| Recirculated Water use Water Recirculation | 
| Recklinghausen Disease of Nerve use Neurofibromatosis 1 | 
| Recklinghausen's Disease of Bone use Osteitis Fibrosa Cystica | 
| Reclaimed Water use Water Recycling | 
| Recognition (Psychology) | 
| Recognized Refugee | 
| Recombinant Colony-Stimulating Factors use Colony-Stimulating Factors, Recombinant | 
| Recombinant DNA use DNA, Recombinant | 
| Recombinant DNA Vaccines use Vaccines, DNA | 
| Recombinant Erythropoietin use Erythropoietin, Recombinant | 
| Recombinant Fusion Proteins | 
| Recombinant G-CSF use Granulocyte Colony Stimulating Factor, Recombinant | 
| Recombinant GM-CSF use Granulocyte Macrophage Colony-Stimulating Factors, Recombinant | 
| Recombinant Granulocyte Colony Stimulating Factor use Granulocyte Colony Stimulating Factor, Recombinant | 
| Recombinant Granulocyte-Macrophage Colony-Stimulating Factors use Granulocyte Macrophage Colony-Stimulating Factors, Recombinant | 
| Recombinant Growth Hormone use Growth Hormone | 
| Recombinant Interferon alfa-2a use Interferon Alfa-2a | 
| Recombinant Interferon alfa-2b use Interferon Alfa-2b | 
| Recombinant Interferon alfa-2c use Interferon Alfa-2c | 
| Recombinant Interferon-gamma use Interferon-gamma, Recombinant | 
| Recombinant Proteins | 
| Recombinant-Methionyl Human Granulocyte Colony-Stimulating Factor use Filgrastim | 
| Recombinases | 
| Recombination, Genetic | 
| Recombination, Interspecies use Gene Transfer, Horizontal | 
| Recombination-Activating Genes-1 use Genes, RAG-1 | 
| Recommended Dietary Allowances use Nutrition Policy | 
| Reconstruction | 
| Reconstructive Surgical Procedures | 
| Reconstructive Surgical Procedures, Cosmetic use Reconstructive Surgical Procedures | 
| Recontact use Duty to Recontact | 
| Record Linkage, Medical use Medical Record Linkage | 
| Records Control use Forms and Records Control | 
| Records as Topic | 
| Recoverin | 
| Recovery use Recycling (Environmental Health) | 
| Recovery Period, Anesthesia use Anesthesia Recovery Period | 
| Recovery Room | 
| Recovery Room Nursing use Postanesthesia Nursing | 
| Recovery of Function | 
| Recreation | 
| Recreation and Leisure Activities Centers use Centers of Connivance and Leisure | 
| Recreation and Leisure Activities Centres use Centers of Connivance and Leisure | 
| Recreational Drugs use Street Drugs | 
| Recreational Water | 
| Recreational Zones | 
| Recrudescence use Recurrence | 
| Recruitment Detection, Audiologic | 
| Recruitment, Loudness use Hyperacusis | 
| Recruitment, Neurophysiological | 
| Rectal Cancer use Rectal Neoplasms | 
| Rectal Diseases | 
| Rectal Drug Administration use Administration, Rectal | 
| Rectal Fistula | 
| Rectal Gland use Salt Gland | 
| Rectal Neoplasms | 
| Rectal Prolapse | 
| Rectal Suppositories use Suppositories | 
| Rectal Surgery (Specialty) use Colorectal Surgery | 
| Rectal Tumors use Rectal Neoplasms | 
| Rectocele | 
| Rectocolitis use Proctocolitis | 
| Rectocolitis, Hemorrhagic use Proctocolitis | 
| Rectocolitis, Ulcerative use Proctocolitis | 
| Rectosigmoiditis use Proctocolitis | 
| Rectovaginal Fistula | 
| Rectum | 
| Rectus Abdominis | 
| Recurrence | 
| Recurrent Laryngeal Nerve | 
| Recycling use Conservation of Natural Resources | 
| Recycling (Environmental Health) | 
| Recycling, Equipment use Equipment Reuse | 
| Red Blood Cell Count use Erythrocyte Count | 
| Red Blood Cell Membrane Sialoglycoprotein use Glycophorin | 
| Red Blood Cell Transfusion use Erythrocyte Transfusion | 
| Red Blood Cells use Erythrocytes | 
| Red Bryony use Bryonia dioica | 
| Red Bugs use Trombiculidae | 
| Red Cell Ghost use Erythrocyte Membrane | 
| Red Cell Indices use Erythrocyte Indices | 
| Red Cell Mass use Erythrocyte Volume | 
| Red Cell Substitutes use Blood Substitutes | 
| Red Cross | 
| Red Dye No. 2 use Amaranth Dye | 
| Red Marrow use Bone Marrow | 
| Red Monkey use Erythrocebus patas | 
| Red Nucleus | 
| Red Pepper use Capsicum | 
| Red Quina use China officinalis | 
| Red Sea use Indian Ocean | 
| Red Tide use Dinoflagellida | 
| Red clover use Trifolium | 
| Red-Cell Aplasia, Pure | 
| Redistributive Justice use Equity in the Resource Allocation | 
| Redox use Oxidation-Reduction | 
| Reduced Gravity use Hypogravity | 
| Reducing Agents | 
| Reductants use Reducing Agents | 
| Reductases use Oxidoreductases | 
| Reduction Gear use Water and Sewerage System Accessories | 
| Reductive Pentose Phosphate Cycle use Photosynthesis | 
| Reduviidae | 
| Redwood use Sequoia | 
| Reed-Sternberg Cells | 
| Reef | 
| Reeler Mice use Mice, Neurologic Mutants | 
| Reference Books | 
| Reference Books, Medical | 
| Reference Centers use Information Services | 
| Reference Drugs | 
| Reference Ranges use Reference Values | 
| Reference Standards | 
| Reference Values | 
| Referral and Consultation | 
| Referred Pain use Pain, Referred | 
| Refetoff Syndrome use Thyroid Hormone Resistance Syndrome | 
| Refined Sugar use Sugar | 
| Refining | 
| Refitting use Remodeling | 
| Reflex | 
| Reflex Epilepsy use Epilepsy, Reflex | 
| Reflex Epilepsy, Audiogenic use Epilepsy, Reflex | 
| Reflex Epilepsy, Cursive (Running) use Epilepsy, Reflex | 
| Reflex Epilepsy, Eating-Induced use Epilepsy, Reflex | 
| Reflex Epilepsy, Musicogenic use Epilepsy, Reflex | 
| Reflex Epilepsy, Photosensitive use Epilepsy, Reflex | 
| Reflex Epilepsy, Reading use Epilepsy, Reflex | 
| Reflex Sympathetic Dystrophy | 
| Reflex Therapy use Reflexotherapy | 
| Reflex, Abdominal | 
| Reflex, Abnormal | 
| Reflex, Acoustic | 
| Reflex, Babinski | 
| Reflex, Baroreceptor use Baroreflex | 
| Reflex, Blink use Blinking | 
| Reflex, Conditioned use Conditioning, Classical | 
| Reflex, Corneal use Blinking | 
| Reflex, Monosynaptic | 
| Reflex, Oculocardiac | 
| Reflex, Orbicularis Oculi use Blinking | 
| Reflex, Pharyngeal use Gagging | 
| Reflex, Psychogalvanic use Galvanic Skin Response | 
| Reflex, Pupillary | 
| Reflex, Stretch | 
| Reflex, Tendon use Reflex, Stretch | 
| Reflex, Vestibulo-Ocular | 
| Reflexology use Massage | 
| Reflexotherapy | 
| Reforestation | 
| Reformatories use Prisons | 
| Refraction, Ocular | 
| Refractive Errors | 
| Refractive Index use Refractometry | 
| Refractive Surgical Procedures | 
| Refractometry | 
| Refractory Anemia use Anemia, Refractory | 
| Refractory Anemia with Excess of Blasts use Anemia, Refractory, with Excess of Blasts | 
| Refractory Period, Electrophysiological | 
| Refractory Period, Neurologic use Refractory Period, Electrophysiological | 
| Refractory Period, Psychological | 
| Refrigeration | 
| Refsum Disease | 
| Refsum Disease, Infantile | 
| Refuge | 
| Refugee Camps | 
| Refugee Sur Place | 
| Refugees | 
| Refuges use Shelters | 
| Refusal of Treatment use Treatment Refusal | 
| Refusal to Participate | 
| Refusal to Treat | 
| Refuse Disposal | 
| Refuse Dumps use Open Dumps | 
| Regeneration | 
| Regeneration, Periodontal Guided Tissue use Guided Tissue Regeneration, Periodontal | 
| Regenerative Medicine | 
| Regional Agencies | 
| Regional Agreements | 
| Regional Blood Flow | 
| Regional Development | 
| Regional Health Planning | 
| Regional Hospital Planning use Hospital Planning | 
| Regional Hospital Plannings use Hospital Planning | 
| Regional Medical Programs | 
| Regional Pacts use Regional Agreements | 
| Regional Perfusion Antineoplastic Chemotherapy use Chemotherapy, Cancer, Regional Perfusion | 
| Regional Plans | 
| Regional Strategies | 
| Regional Subsidence and Cracking | 
| Registered Trademarks | 
| Registrars, Hospital use Medical Staff, Hospital | 
| Registries | 
| Regression (Psychology) | 
| Regression Analysis | 
| Regression Diagnostics use Regression Analysis | 
| Regulation of Gene Expression use Gene Expression Regulation | 
| Regulation of Gene Expression, Archaeal use Gene Expression Regulation, Archaeal | 
| Regulation of Gene Expression, Bacterial use Gene Expression Regulation, Bacterial | 
| Regulation of Gene Expression, Developmental use Gene Expression Regulation, Developmental | 
| Regulation of Gene Expression, Embryologic use Gene Expression Regulation, Developmental | 
| Regulation of Gene Expression, Enzymologic use Gene Expression Regulation, Enzymologic | 
| Regulation of Gene Expression, Fungal use Gene Expression Regulation, Fungal | 
| Regulation of Gene Expression, Leukemic use Gene Expression Regulation, Leukemic | 
| Regulation of Gene Expression, Neoplastic use Gene Expression Regulation, Neoplastic | 
| Regulation of Gene Expression, Plant use Gene Expression Regulation, Plant | 
| Regulation of Gene Expression, Viral use Gene Expression Regulation, Viral | 
| Regulations | 
| Regulations for Policy Organizations | 
| Regulator Locus, araC use Genes, araC | 
| Regulators of G-Protein Signaling Proteins use RGS Proteins | 
| Regulators, G-Protein Signaling use GTP-Binding Protein Regulators | 
| Regulatory Element, Transcriptional use Regulatory Elements, Transcriptional | 
| Regulatory Elements, Transcriptional | 
| Regulatory Regions, Nucleic Acid (Genetics) use Regulatory Sequences, Nucleic Acid | 
| Regulatory Sequences, Nucleic Acid | 
| Regulatory Sequences, Ribonucleic Acid | 
| Regulatory T-Lymphocytes use T-Lymphocytes, Regulatory | 
| Regulon | 
| Regurgitation, Gastric use Gastroesophageal Reflux | 
| Rehabilitation | 
| Rehabilitation Centers | 
| Rehabilitation Centers, Drug use Substance Abuse Treatment Centers | 
| Rehabilitation Nursing | 
| Rehabilitation Outcome use Treatment Outcome | 
| Rehabilitation Services | 
| Rehabilitation of Hearing Impaired | 
| Rehabilitation of Speech and Language Disorders | 
| Rehabilitation, Vocational | 
| Rehmannia | 
| Rehydration use Fluid Therapy | 
| Rehydration Solutions | 
| Rehydration, Oral use Fluid Therapy | 
| Reichel's Syndrome use Chondromatosis, Synovial | 
| Reiki use Therapeutic Touch | 
| Reimbursement Mechanisms | 
| Reimbursement, Disproportionate Share | 
| Reimbursement, Fee-for-Service use Fee-for-Service Plans | 
| Reimbursement, Health Insurance use Insurance, Health, Reimbursement | 
| Reimbursement, Incentive | 
| Reimbursement, Prospective use Prospective Payment System | 
| Reimplantation use Replantation | 
| Reimplantation, Tooth use Tooth Replantation | 
| Reindeer | 
| Reinerz Aqua | 
| Reinforced Concrete | 
| Reinforced Concrete Constructions use Reinforced Concrete | 
| Reinforced Concrete Pipes | 
| Reinforced Concrete Structures use Reinforced Concrete | 
| Reinforced Concrete Tanks | 
| Reinforcement (Psychology) | 
| Reinforcement Schedule | 
| Reinforcement, Social | 
| Reinforcement, Verbal | 
| Reinforcing Factors use Causality | 
| Reishi | 
| Rejection (Psychology) | 
| Rejuvenation | 
| Relapse use Recurrence | 
| Relapsing Fever | 
| Relapsing Fever Ticks use Ornithodoros | 
| Relapsing-Remitting Multiple Sclerosis use Multiple Sclerosis, Relapsing-Remitting | 
| Relative Biological Effectiveness | 
| Relative Risk use Risk | 
| Relative Risk (Public Health) | 
| Relative Value Scales | 
| Relative-Value Schedules use Relative Value Scales | 
| Relaxation | 
| Relaxation Techniques | 
| Relaxation Therapy use Relaxation Techniques | 
| Relaxin | 
| Released of Products use Product Release | 
| Reliability and Validity use Reproducibility of Results | 
| Relief Work | 
| Relief, Assistance and Protection in Disasters | 
| Religion | 
| Religion and Medicine | 
| Religion and Psychology | 
| Religion and Science | 
| Religion and Sex | 
| Religious Beliefs use Religion | 
| Religious Ethics use Religion | 
| Religious Hospitals use Hospitals, Religious | 
| Religious Philosophies | 
| Remantadine use Rimantadine | 
| Remedial Teaching | 
| Remediation | 
| Reminder Systems | 
| Reminyl use Galantamine | 
| Remission Induction | 
| Remission, Spontaneous | 
| Remission, Spontaneous Neoplasm use Neoplasm Regression, Spontaneous | 
| Remittent Fever use Malaria | 
| Remodeling | 
| Remote Consultation | 
| Remote Operations (Robotics) use Robotics | 
| Remote Sensors | 
| Remote Sounding | 
| Removal of Hulls Agent use Washing Agents | 
| Removal of Hulls Agents use Washing Agents | 
| Removers of Polish Nail, Cuticle and Nicotin Spot (Mechanical and Chemical Types) use Products for Nails and Cuticles | 
| Remoxipride | 
| Renal Agents | 
| Renal Aminoacidurias | 
| Renal Artery | 
| Renal Artery Obstruction | 
| Renal Artery Stenosis use Renal Artery Obstruction | 
| Renal Blood Flow use Renal Circulation | 
| Renal Blood Flow, Effective | 
| Renal Calculi use Kidney Calculi | 
| Renal Cancer use Kidney Neoplasms | 
| Renal Circulation | 
| Renal Cortical Necrosis use Kidney Cortex Necrosis | 
| Renal Dialysis | 
| Renal Dialysis Units, Hospital use Hemodialysis Units, Hospital | 
| Renal Dialysis, Home use Hemodialysis, Home | 
| Renal Disease, End-Stage use Kidney Failure, Chronic | 
| Renal Failure use Kidney Failure | 
| Renal Failure, Acute use Kidney Failure, Acute | 
| Renal Failure, Chronic use Kidney Failure, Chronic | 
| Renal Failure, End-Stage use Kidney Failure, Chronic | 
| Renal Fanconi Syndrome use Fanconi Syndrome | 
| Renal Insufficiency | 
| Renal Insufficiency, Acute | 
| Renal Insufficiency, Chronic | 
| Renal Osteodystrophy | 
| Renal Papillitis, Necrotizing use Kidney Papillary Necrosis | 
| Renal Pelvis use Kidney Pelvis | 
| Renal Plasma Flow | 
| Renal Plasma Flow, Effective | 
| Renal Replacement Therapy | 
| Renal Rickets use Renal Osteodystrophy | 
| Renal Transplantation use Kidney Transplantation | 
| Renal Tubular Acidosis use Acidosis, Renal Tubular | 
| Renal Tubular Acidosis, Type I use Acidosis, Renal Tubular | 
| Renal Tubular Acidosis, Type II use Acidosis, Renal Tubular | 
| Renal Tubular Acidosis, Type IV use Hypoaldosteronism | 
| Renal Tubular Transport, Inborn Errors | 
| Renal Veins | 
| Renaturation, Protein use Protein Renaturation | 
| Renealmia use Zingiberaceae | 
| Renewable Energy use Non Conventional Energy | 
| Renewable Resources | 
| Renewal of Functioning Authorization | 
| Renilla | 
| Renin | 
| Renin-Angiotensin System | 
| Renin-Angiotensin-Aldosterone System use Renin-Angiotensin System | 
| Renin-Substrate use Angiotensinogen | 
| Rennin use Chymosin | 
| Renography use Radioisotope Renography | 
| Reoperation | 
| Reoviridae | 
| Reoviridae Infections | 
| Reovirus 1 use Orthoreovirus, Mammalian | 
| Reovirus 2 use Orthoreovirus, Mammalian | 
| Reovirus 3 use Mammalian orthoreovirus 3 | 
| Reovirus Infections use Reoviridae Infections | 
| Reoviruses, Aquatic use Reoviridae | 
| Repairing use Corrective Maintenance | 
| Repatriation | 
| Repeat Cesarean Section use Cesarean Section, Repeat | 
| Repeat-Associated siRNA use RNA, Small Interfering | 
| Reperfusion | 
| Reperfusion Injury | 
| Reperfusion Injury, Myocardial use Myocardial Reperfusion Injury | 
| Reperfusion, Myocardial use Myocardial Reperfusion | 
| Repertorial Additions | 
| Repertorial Errors | 
| Repertorial Structure | 
| Repertorial Symptoms | 
| Repertorization | 
| Repertorization, Computed | 
| Repertory | 
| Repertory Techniques use Repertorization | 
| Repertory, Barthel | 
| Repertory, Boenninghausen | 
| Repertory, Boericke | 
| Repertory, Degrees | 
| Repertory, Gentry | 
| Repertory, Hering | 
| Repertory, Kent | 
| Repertory, Kent-Eizayaga | 
| Repertory, Kishore | 
| Repertory: Abdomen Section | 
| Repertory: Back Section | 
| Repertory: Bladder Section | 
| Repertory: Chest Section | 
| Repertory: Chill Section | 
| Repertory: Cough Section | 
| Repertory: Delusions Section | 
| Repertory: Drinks and Foods Section | 
| Repertory: Ear Section | 
| Repertory: Expectoration Section | 
| Repertory: External Throat Section | 
| Repertory: Extremities Section | 
| Repertory: Eye Section | 
| Repertory: Face Section | 
| Repertory: Female Genitalia Section | 
| Repertory: Fever Section | 
| Repertory: Generalities Section | 
| Repertory: Head Section | 
| Repertory: Hearing Section | 
| Repertory: Internal Throat Section use Repertory: Throat Section | 
| Repertory: Kidneys Section | 
| Repertory: Larynx and Trachea Section | 
| Repertory: Male Genitalia Section | 
| Repertory: Mind Section | 
| Repertory: Mouth Section | 
| Repertory: Nails Section | 
| Repertory: Nose Section | 
| Repertory: Perspiration Section | 
| Repertory: Prostate Section | 
| Repertory: Rectum Section | 
| Repertory: Respiration Section | 
| Repertory: Skin Section | 
| Repertory: Sleep Section | 
| Repertory: Stomach Section | 
| Repertory: Stool Section | 
| Repertory: Taste Section | 
| Repertory: Teeth Section | 
| Repertory: Throat Section | 
| Repertory: Urethra Section | 
| Repertory: Urine Section | 
| Repertory: Vertigo Section | 
| Repertory: Vision Section | 
| Repetition Strain Injury use Cumulative Trauma Disorders | 
| Repetitive Region use Repetitive Sequences, Nucleic Acid | 
| Repetitive Sequences, Amino Acid | 
| Repetitive Sequences, Dispersed use Interspersed Repetitive Sequences | 
| Repetitive Sequences, Interspersed use Interspersed Repetitive Sequences | 
| Repetitive Sequences, Nucleic Acid | 
| Replacement Therapy, Estrogen use Estrogen Replacement Therapy | 
| Replacement Therapy, Hormone use Hormone Replacement Therapy | 
| Replantation | 
| Replantation, Tooth use Tooth Replantation | 
| Replica Techniques | 
| Replication Factor A use Replication Protein A | 
| Replication Factor A Single-Stranded DNA-Binding Protein use Replication Protein A | 
| Replication Factor C use Replication Protein C | 
| Replication Origin | 
| Replication Protein A | 
| Replication Protein C | 
| Replication Unit use Replicon | 
| Replicative Senescence use Cell Aging | 
| Replicon | 
| Reporter Genes use Genes, Reporter | 
| Repressed Memory use Repression | 
| Repression | 
| Repression-Sensitization | 
| Repression-Sensitization Scales use Repression-Sensitization | 
| Repressor Molecules use Repressor Proteins | 
| Repressor Proteins | 
| Reproducibility of Results | 
| Reproduction | 
| Reproduction, Asexual | 
| Reproductive Behavior | 
| Reproductive Control Agents | 
| Reproductive Health Services | 
| Reproductive History | 
| Reproductive Medicine | 
| Reproductive Rights | 
| Reproductive Sterilization use Sterilization, Reproductive | 
| Reproductive Techniques | 
| Reproductive Techniques, Assisted | 
| Reproductive Technology use Reproductive Techniques | 
| Reproductive Technology, Assisted use Reproductive Techniques, Assisted | 
| Reproductive and Urinary Physiology | 
| Reptilase Time use Thrombin Time | 
| Reptiles | 
| Reptilian Proteins | 
| Republic of China use Taiwan | 
| Republic of South Africa use South Africa | 
| Request for Disaster Assistance | 
| Request for Proposal use Competitive Bidding | 
| Rescue Personnel | 
| Rescue Work | 
| Rescue Workers use Rescue Personnel | 
| Rescue in Confined Spaces | 
| Research | 
| Research Design | 
| Research Embryo Creation | 
| Research Ethics use Ethics, Research | 
| Research Expenditures | 
| Research Financing | 
| Research Financing Systems | 
| Research Groups | 
| Research Institutes use Academies and Institutes | 
| Research Misconduct use Scientific Misconduct | 
| Research Personnel | 
| Research Policy Evaluation | 
| Research Priorities use Research | 
| Research Promotion | 
| Research Protocols, Clinical use Clinical Protocols | 
| Research Reports | 
| Research Subject Recruitment use Patient Selection | 
| Research Subjects | 
| Research Support as Topic | 
| Research Support, N.I.H., Extramural | 
| Research Support, N.I.H., Intramural | 
| Research Support, Non-U.S. Gov't | 
| Research Support, U.S. Gov't, Non-P.H.S. | 
| Research Support, U.S. Gov't, P.H.S. | 
| Research and Development Project Indicators | 
| Research and Development Projects | 
| Research and New Techniques | 
| Research in Health Services | 
| Research on Health Personnel use Health Manpower | 
| Research, Clinical Nursing use Clinical Nursing Research | 
| Research, Dental use Dental Research | 
| Research, Health Services use Health Services Research | 
| Research, Nursing use Nursing Research | 
| Research, Nursing Administration use Nursing Administration Research | 
| Research, Nursing Education use Nursing Education Research | 
| Research, Nursing Evaluation use Nursing Evaluation Research | 
| Research, Nursing Methodology use Nursing Methodology Research | 
| Researcher Exchange | 
| Researcher Exchange Policy | 
| Researcher Performance Evaluation Systems | 
| Researcher-Subject Relations | 
| Researchers use Research Personnel | 
| Reseda use Resedaceae | 
| Resedaceae | 
| Reserpine | 
| Reserpinum | 
| Reservoir Routing use Flood Routing | 
| Reservoirs | 
| Residence Characteristics | 
| Residence Time | 
| Residency, Dental use Internship and Residency | 
| Residency, Medical use Internship and Residency | 
| Residency, Nonmedical use Internship, Nonmedical | 
| Resident Population | 
| Residential Facilities | 
| Residential Mobility | 
| Residential Treatment | 
| Residual Cancer use Neoplasm, Residual | 
| Residual Chlorine | 
| Residual Tumor use Neoplasm, Residual | 
| Residual Volume | 
| Resin Cements | 
| Resin-Bonded Acid-Etched Fixed Partial Denture use Denture, Partial, Fixed, Resin-Bonded | 
| Resin-Bonded Bridge use Denture, Partial, Fixed, Resin-Bonded | 
| Resin-Bonded Fixed Partial Denture use Denture, Partial, Fixed, Resin-Bonded | 
| Resina itu use Itu | 
| Resins | 
| Resins, Plant | 
| Resins, Synthetic | 
| Resistance Factors use R Factors | 
| Resistance Transfer Factor use F Factor | 
| Resistance, Natural use Immunity, Natural | 
| Resistant Ovary Syndrome use Ovarian Failure, Premature | 
| Resistin | 
| Resocyanine use Hymecromone | 
| Resolutions | 
| Resolvases, Holliday Junction use Holliday Junction Resolvases | 
| Resolvases, Transposon use Transposon Resolvases | 
| Resorcinols | 
| Resorcinum | 
| Resorts use Health Resorts | 
| Resource Allocation | 
| Resource Guides | 
| Resource-Based Relative Value Scale use Relative Value Scales | 
| Resources Management | 
| Resources for Research | 
| Respiration | 
| Respiration Disorders | 
| Respiration, Artificial | 
| Respiration, Cell use Cell Respiration | 
| Respirator Weaning use Ventilator Weaning | 
| Respirators use Ventilators, Mechanical | 
| Respirators, Air-Purifying use Respiratory Protective Devices | 
| Respirators, Industrial use Respiratory Protective Devices | 
| Respirators, Negative-Pressure use Ventilators, Negative-Pressure | 
| Respirators, Pulmonary, Negative-Pressure use Ventilators, Negative-Pressure | 
| Respiratory Acidosis use Acidosis, Respiratory | 
| Respiratory Airflow use Pulmonary Ventilation | 
| Respiratory Alkalosis use Alkalosis, Respiratory | 
| Respiratory Aspiration | 
| Respiratory Burst | 
| Respiratory Care Units | 
| Respiratory Center | 
| Respiratory Chain use Electron Transport | 
| Respiratory Chain Deficiencies, Mitochondrial use Mitochondrial Diseases | 
| Respiratory Circulation use Pulmonary Circulation | 
| Respiratory Dead Space | 
| Respiratory Depression use Respiratory Insufficiency | 
| Respiratory Distress Syndrome, Acute use Respiratory Distress Syndrome, Adult | 
| Respiratory Distress Syndrome, Adult | 
| Respiratory Distress Syndrome, Newborn | 
| Respiratory Drainage, Postural use Drainage, Postural | 
| Respiratory Drug Administration use Administration, Inhalation | 
| Respiratory Enteric Orphan Viruses use Reoviridae | 
| Respiratory Epithelium use Respiratory Mucosa | 
| Respiratory Failure use Respiratory Insufficiency | 
| Respiratory Function Tests | 
| Respiratory Hypersensitivity | 
| Respiratory Insufficiency | 
| Respiratory Mechanics | 
| Respiratory Mucosa | 
| Respiratory Muscle Training use Breathing Exercises | 
| Respiratory Muscles | 
| Respiratory Paralysis | 
| Respiratory Physiologic Phenomena | 
| Respiratory Physiologic Processes | 
| Respiratory Physiology | 
| Respiratory Protective Devices | 
| Respiratory Sounds | 
| Respiratory Stimulants use Respiratory System Agents | 
| Respiratory Syncytial Virus Infections | 
| Respiratory Syncytial Virus Vaccines | 
| Respiratory Syncytial Virus, Bovine | 
| Respiratory Syncytial Virus, Human | 
| Respiratory Syncytial Viruses | 
| Respiratory Syndrome, Severe Acute use Severe Acute Respiratory Syndrome | 
| Respiratory System | 
| Respiratory System Abnormalities | 
| Respiratory System Agents | 
| Respiratory Therapy | 
| Respiratory Therapy Department, Hospital | 
| Respiratory Tract Diseases | 
| Respiratory Tract Fistula | 
| Respiratory Tract Infections | 
| Respiratory Tract Neoplasms | 
| Respiratory Transport | 
| Respirovirus | 
| Respirovirus Infections | 
| Respite Care | 
| Response Element, Serum use Serum Response Element | 
| Response Element, Vitamin D use Vitamin D Response Element | 
| Response Elements | 
| Response Latency use Reaction Time | 
| Response Time use Reaction Time | 
| Response, Acute-Phase use Acute-Phase Reaction | 
| Responsibility, Social use Social Responsibility | 
| Responsible Sex use Safe Sex | 
| Rest | 
| Rest Vertical Dimension use Vertical Dimension | 
| Restaurants | 
| Resting Phase use G0 Phase | 
| Resting Potentials use Membrane Potentials | 
| Resting Tremor use Tremor | 
| Restless Legs Syndrome | 
| Restlessness use Psychomotor Agitation | 
| Reston Ebola virus use Ebolavirus | 
| Restraint, Physical | 
| Restriction Endonucleases use DNA Restriction Enzymes | 
| Restriction Endonucleases, Type I use Deoxyribonucleases, Type I Site-Specific | 
| Restriction Endonucleases, Type II use Deoxyribonucleases, Type II Site-Specific | 
| Restriction Endonucleases, Type III use Deoxyribonucleases, Type III Site-Specific | 
| Restriction Fragment Length Polymorphism use Polymorphism, Restriction Fragment Length | 
| Restriction Mapping | 
| Restriction-Modification Systems use DNA Restriction-Modification Enzymes | 
| Resume, Job use Job Application | 
| Resurrection Plant use Craterostigma | 
| Resuscitation | 
| Resuscitation Decisions use Resuscitation Orders | 
| Resuscitation Orders | 
| Retainers, Orthodontic use Orthodontic Retainers | 
| Retardation, Mental use Mental Retardation | 
| Rete Testis | 
| Retention (Psychology) | 
| Reticular Formation | 
| Reticulate Nuclei of Thalamus use Intralaminar Thalamic Nuclei | 
| Reticulin | 
| Reticulocyte Count | 
| Reticulocytes | 
| Reticulocytosis | 
| Reticuloendothelial System use Mononuclear Phagocyte System | 
| Reticuloendotheliosis | 
| Reticuloendotheliosis Viruses, Avian | 
| Reticuloendotheliosis virus | 
| Reticuloendotheliosis, Leukemic use Leukemia, Hairy Cell | 
| Reticulohistiocytoma use Histiocytosis, Non-Langerhans-Cell | 
| Reticulolymphosarcoma use Lymphoma | 
| Reticulopodia use Pseudopodia | 
| Reticulum | 
| Reticulum Cell-Like Sarcoma, Yoshida use Sarcoma, Yoshida | 
| Retina | 
| Retinal use Retinaldehyde | 
| Retinal Anlage Tumor use Neuroectodermal Tumor, Melanotic | 
| Retinal Artery | 
| Retinal Artery Occlusion | 
| Retinal Bipolar Cells | 
| Retinal Breaks use Retinal Perforations | 
| Retinal Degeneration | 
| Retinal Dehydrogenase | 
| Retinal Detachment | 
| Retinal Dialyses use Retinal Perforations | 
| Retinal Diseases | 
| Retinal Disparity use Vision Disparity | 
| Retinal Drusen | 
| Retinal Dysplasia | 
| Retinal Ganglion Cells | 
| Retinal Hemorrhage | 
| Retinal Holes use Retinal Perforations | 
| Retinal Horizontal Cells | 
| Retinal Necrosis Syndrome, Acute | 
| Retinal Neoplasms | 
| Retinal Neovascularization | 
| Retinal Perforations | 
| Retinal Pigment Epithelial Detachment use Retinal Detachment | 
| Retinal Pigment Epithelium use Pigment Epithelium of Eye | 
| Retinal Pigments | 
| Retinal S-Antigen use Arrestin | 
| Retinal Tears use Retinal Perforations | 
| Retinal Vasculitis | 
| Retinal Vein | 
| Retinal Vein Occlusion | 
| Retinal Vessels | 
| Retinal-Blood Barrier use Blood-Retinal Barrier | 
| Retinaldehyde | 
| Retinene use Retinaldehyde | 
| Retinitis | 
| Retinitis Pigmentosa | 
| Retinitis, Cytomegalovirus use Cytomegalovirus Retinitis | 
| Retinoblastoma | 
| Retinoblastoma Genes use Genes, Retinoblastoma | 
| Retinoblastoma Nuclear Phosphoprotein p105-Rb use Retinoblastoma Protein | 
| Retinoblastoma Protein | 
| Retinoblastoma-Like Protein 1 use Retinoblastoma-Like Protein p107 | 
| Retinoblastoma-Like Protein 2 use Retinoblastoma-Like Protein p130 | 
| Retinoblastoma-Like Protein p107 | 
| Retinoblastoma-Like Protein p130 | 
| Retinoic Acid use Tretinoin | 
| Retinoic Acid Receptors use Receptors, Retinoic Acid | 
| Retinoic Acid-Binding Proteins use Receptors, Retinoic Acid | 
| Retinoid X Receptor use Retinoid X Receptors | 
| Retinoid X Receptor alpha | 
| Retinoid X Receptor beta | 
| Retinoid X Receptor gamma | 
| Retinoid X Receptors | 
| Retinoids | 
| Retinol use Vitamin A | 
| Retinol O-Fatty-Acyltransferase | 
| Retinol-Binding Proteins | 
| Retinol-Binding Proteins, Cellular | 
| Retinol-Binding Proteins, Plasma | 
| Retinopathy of Prematurity | 
| Retinoschisis | 
| Retinoschisis, Degenerative use Retinoschisis | 
| Retinoschisis, Juvenile, X-Linked use Retinoschisis | 
| Retinoscopes | 
| Retinoscopy | 
| Retired use Retirement | 
| Retirement | 
| Retirement Benefits use Pensions | 
| Retracted Publication | 
| Retraction of Publication | 
| Retraction of Publication as Topic | 
| Retraining, Professional use Education, Professional, Retraining | 
| Retreatment | 
| Retrobulbar Hemorrhage | 
| Retrobulbar Neuritis use Optic Neuritis | 
| Retrocochlear Diseases | 
| Retrocochlear Hearing Loss use Retrocochlear Diseases | 
| Retroelements | 
| Retrofitting use Remodeling | 
| Retrognathism | 
| Retrograde Amnesia use Amnesia, Retrograde | 
| Retrograde Degeneration | 
| Retrograde Degeneration, Transneuronal use Retrograde Degeneration | 
| Retrograde Obturation | 
| Retrolental Fibroplasia use Retinopathy of Prematurity | 
| Retroperitoneal Fibrosis | 
| Retroperitoneal Neoplasms | 
| Retroperitoneal Space | 
| Retropharyngeal Abscess | 
| Retropneumoperitoneum | 
| Retroposons use Retroelements | 
| Retrospective Moral Judgment | 
| Retrospective Studies | 
| Retrotransposons use Retroelements | 
| Retroviridae | 
| Retroviridae Infections | 
| Retroviridae Proteins | 
| Retroviridae Proteins, Oncogenic | 
| Retrovirus Infections use Retroviridae Infections | 
| Retrovirus Proteins use Retroviridae Proteins | 
| Retrovirus-Like Elements use Retroelements | 
| Retroviruses use Retroviridae | 
| Retroviruses Type B, Mammalian use Betaretrovirus | 
| Retroviruses Type C, Avian use Alpharetrovirus | 
| Retroviruses Type C, Mammalian use Gammaretrovirus | 
| Retroviruses Type D use Betaretrovirus | 
| Retroviruses, Endogenous use Endogenous Retroviruses | 
| Retroviruses, Simian | 
| Rett Syndrome | 
| Return of Old Symptoms use Old Symptoms Return | 
| Returnee | 
| Returning State | 
| Reuniens Thalamic Nucleus use Midline Thalamic Nuclei | 
| Reunion | 
| Reuptake Inhibitors, Neurotransmitter use Neurotransmitter Uptake Inhibitors | 
| Reusable Solid Wastes use Solid Waste Use | 
| Reuse use Recycling (Environmental Health) | 
| Reused Water use Wastewater Use | 
| Revalidation of the Products Registration | 
| Reversal Learning | 
| Reverse Geologic Fault use Geologic Fault, Reverse | 
| Reverse Immunoblotting use Immunoblotting | 
| Reverse One-Hybrid System Techniques use Two-Hybrid System Techniques | 
| Reverse Osmosis | 
| Reverse T3 Thyroid hormone use Triiodothyronine, Reverse | 
| Reverse Transcriptase use RNA-Directed DNA Polymerase | 
| Reverse Transcriptase Inhibitors | 
| Reverse Transcriptase Polymerase Chain Reaction | 
| Reverse Transcription | 
| Reverse Triiodothyronine use Triiodothyronine, Reverse | 
| Reverse Two-Hybrid System Techniques use Two-Hybrid System Techniques | 
| Reversible Inhibitors of Monoamine Oxidase use Monoamine Oxidase Inhibitors | 
| Review | 
| Review Literature as Topic | 
| Revision, Joint use Reoperation | 
| Revision, Surgical use Reoperation | 
| Revolutionary War use American Revolution | 
| Reward | 
| Rewarming | 
| Reye Syndrome | 
| Reynolds Number | 
| Rh Factors use Rh-Hr Blood-Group System | 
| Rh Immune Globulin use Rho(D) Immune Globulin | 
| Rh Isoimmunization | 
| Rh-Hr Blood-Group System | 
| Rhabdiasoidea | 
| Rhabditida | 
| Rhabditida Infections | 
| Rhabditis use Rhabditoidea | 
| Rhabditoidea | 
| Rhabdoid Tumor | 
| Rhabdomyolysis | 
| Rhabdomyoma | 
| Rhabdomyosarcoma | 
| Rhabdomyosarcoma, Alveolar | 
| Rhabdomyosarcoma, Embryonal | 
| Rhabdoviridae | 
| Rhabdoviridae Infections | 
| Rhadinovirus | 
| Rhagoletis use Tephritidae | 
| Rhammus purshiana use Frangula | 
| Rhamnaceae | 
| Rhamnose | 
| Rhamnus | 
| Rhamnus californica | 
| Rhamnus cathartica | 
| Rhamnus frangula | 
| Rhamnus purshiana use Cascara sagrada | 
| Rhatany use Krameriaceae | 
| Rhazya use Apocynaceae | 
| Rheas use Rheiformes | 
| Rheedia use Clusiaceae | 
| Rheiformes | 
| Rhenium | 
| Rheography use Plethysmography, Impedance | 
| Rheology | 
| Rhesus Blood-Group System use Rh-Hr Blood-Group System | 
| Rhesus Monkey use Macaca mulatta | 
| Rhetinic Acid use Glycyrrhetinic Acid | 
| Rheum | 
| Rheum Emodin use Emodin | 
| Rheum palmatum | 
| Rheumatic Diseases | 
| Rheumatic Fever | 
| Rheumatic Heart Disease | 
| Rheumatic Nodule | 
| Rheumatism use Rheumatic Diseases | 
| Rheumatism, Articular, Acute use Rheumatic Fever | 
| Rheumatism, Muscular use Fibromyalgia | 
| Rheumatism, Peri-Extra-Articular use Polymyalgia Rheumatica | 
| Rheumatoid Arthritis use Arthritis, Rheumatoid | 
| Rheumatoid Factor | 
| Rheumatoid Nodule | 
| Rheumatoid Purpura use Purpura, Schoenlein-Henoch | 
| Rheumatoid Spondylitis use Spondylitis, Ankylosing | 
| Rheumatology | 
| Rhinencephalon use Olfactory Pathways | 
| Rhinitis | 
| Rhinitis, Allergic, Nonseasonal use Rhinitis, Allergic, Perennial | 
| Rhinitis, Allergic, Perennial | 
| Rhinitis, Allergic, Seasonal | 
| Rhinitis, Atrophic | 
| Rhinitis, Vasomotor | 
| Rhinolophus use Chiroptera | 
| Rhinomanometry | 
| Rhinometry, Acoustic | 
| Rhinopharynx use Nasopharynx | 
| Rhinophyma | 
| Rhinoplasty | 
| Rhinoscleroma | 
| Rhinosporidiosis | 
| Rhinosporidium | 
| Rhinotracheitis Virus, Turkey use Metapneumovirus | 
| Rhinovirus | 
| Rhipicephalus | 
| Rhipicephalus sanguineus | 
| Rhizobiaceae | 
| Rhizobium | 
| Rhizobium etli | 
| Rhizobium galegae use Rhizobium | 
| Rhizobium leguminosarum | 
| Rhizobium lupini use Rhizobium | 
| Rhizobium meliloti use Sinorhizobium meliloti | 
| Rhizobium phaseoli | 
| Rhizobium radiobacter | 
| Rhizobium tropici | 
| Rhizoctonia | 
| Rhizoma Pinelliae use Pinellia | 
| Rhizome | 
| Rhizomelic Chondrodysplasia Punctata use Chondrodysplasia Punctata, Rhizomelic | 
| Rhizomucor | 
| Rhizophora use Rhizophoraceae | 
| Rhizophora mangle use Rhizophoraceae | 
| Rhizophoraceae | 
| Rhizopus | 
| Rhizotomy | 
| Rho Factor | 
| Rho(D) Immune Globulin | 
| Rhodallinum use Thiosinaminum | 
| Rhodamine 123 | 
| Rhodamines | 
| Rhodanates use Thiocyanates | 
| Rhodanese use Thiosulfate Sulfurtransferase | 
| Rhodanine | 
| Rhode Island | 
| Rhodesia, Northern use Zambia | 
| Rhodesia, Southern use Zimbabwe | 
| Rhodiola | 
| Rhodium | 
| Rhodium Metallicum | 
| Rhodium Oxydatum Nitricum | 
| Rhodnius | 
| Rhodobacter | 
| Rhodobacter capsulatus | 
| Rhodobacter sphaeroides | 
| Rhodobacteraceae | 
| Rhodococcus | 
| Rhodococcus equi | 
| Rhodocyclaceae | 
| Rhodocyclus use Rhodocyclaceae | 
| Rhododendron | 
| Rhododendron chrysanthum | 
| Rhodomicrobium | 
| Rhodomicrobium vannielii use Rhodomicrobium | 
| Rhodophyta use Algae, Red | 
| Rhodopseudomonas | 
| Rhodopseudomonas capsulatus use Rhodobacter capsulatus | 
| Rhodopseudomonas sphaeroides use Rhodobacter sphaeroides | 
| Rhodopsin | 
| Rhodopsin Kinase use G-Protein-Coupled Receptor Kinase 1 | 
| Rhodopsins, Microbial | 
| Rhodospirillaceae | 
| Rhodospirillales | 
| Rhodospirillum | 
| Rhodospirillum centenum | 
| Rhodospirillum rubrum | 
| Rhodothermus | 
| Rhodotorula | 
| Rhodovulum | 
| Rhombencephalic Sleep use Sleep, REM | 
| Rhombencephalon | 
| Rhomboid Thalamic Nucleus use Midline Thalamic Nuclei | 
| Rhonchi use Respiratory Sounds | 
| Rhubarb use Rheum | 
| Rhus | 
| Rhus Dermatitis use Dermatitis, Toxicodendron | 
| Rhus aromatica | 
| Rhus cotinus | 
| Rhus diversiloba | 
| Rhus glabra | 
| Rhus laurina | 
| Rhus radicans | 
| Rhus toxicodendron | 
| Rhus venenata | 
| Rhus vernix | 
| Rhyncophthirina use Lice | 
| Rhythmicity use Periodicity | 
| Rhytidectomy use Rhytidoplasty | 
| Rhytidoplasty | 
| Rib Fractures | 
| Ribavirin | 
| Ribes | 
| Ribitol | 
| Riboflavin | 
| Riboflavin Deficiency | 
| Riboflavin Synthase | 
| Ribonuclease A use Ribonuclease, Pancreatic | 
| Ribonuclease H | 
| Ribonuclease H, Calf Thymus use Ribonuclease H | 
| Ribonuclease H, Human Immunodeficiency Virus | 
| Ribonuclease III | 
| Ribonuclease N1 use Ribonuclease T1 | 
| Ribonuclease P | 
| Ribonuclease P, RNA Catalytic Subunit use Ribonuclease P | 
| Ribonuclease T1 | 
| Ribonuclease, Pancreatic | 
| Ribonucleases | 
| Ribonucleic Acid use RNA | 
| Ribonucleic Acid Regulatory Sequences use Regulatory Sequences, Ribonucleic Acid | 
| Ribonucleoprotein Particles, Vault use Vault Ribonucleoprotein Particles | 
| Ribonucleoprotein, U1 Small Nuclear | 
| Ribonucleoprotein, U2 Small Nuclear | 
| Ribonucleoprotein, U4-U6 Small Nuclear | 
| Ribonucleoprotein, U5 Small Nuclear | 
| Ribonucleoprotein, U7 Small Nuclear | 
| Ribonucleoproteins | 
| Ribonucleoproteins, Small Cytoplasmic | 
| Ribonucleoproteins, Small Nuclear | 
| Ribonucleoproteins, Small Nucleolar | 
| Ribonucleoproteins, U4 Small Nuclear use Ribonucleoprotein, U4-U6 Small Nuclear | 
| Ribonucleoproteins, U6 Small Nuclear use Ribonucleoprotein, U4-U6 Small Nuclear | 
| Ribonucleoside Diphosphate Reductase | 
| Ribonucleoside Phosphates use Ribonucleotides | 
| Ribonucleosides | 
| Ribonucleotide Reductases | 
| Ribonucleotides | 
| Ribose | 
| Ribose-Phosphate Pyrophosphokinase | 
| Ribosemonophosphates | 
| Ribosomal DNA use DNA, Ribosomal | 
| Ribosomal Frameshifting use Frameshifting, Ribosomal | 
| Ribosomal Protein S6 | 
| Ribosomal Protein S6 Kinases | 
| Ribosomal Protein S6 Kinases, 70-kDa | 
| Ribosomal Protein S6 Kinases, 90-kDa | 
| Ribosomal Proteins | 
| Ribosomal RNA use RNA, Ribosomal | 
| Ribosomal Spacer DNA use DNA, Ribosomal Spacer | 
| Ribosome Inactivating Proteins | 
| Ribosome Inactivating Proteins, Type 1 | 
| Ribosome Inactivating Proteins, Type 2 | 
| Ribosome Subunits | 
| Ribosome Subunits, Large | 
| Ribosome Subunits, Large, Archaeal | 
| Ribosome Subunits, Large, Bacterial | 
| Ribosome Subunits, Large, Eukaryotic | 
| Ribosome Subunits, Small | 
| Ribosome Subunits, Small, Archaeal | 
| Ribosome Subunits, Small, Bacterial | 
| Ribosome Subunits, Small, Eukaryotic | 
| Ribosomes | 
| Ribostamycin | 
| Ribosylhypoxanthine Monophosphate use Inosine Monophosphate | 
| Ribotyping | 
| Ribovirin use Ribavirin | 
| Ribozymes use RNA, Catalytic | 
| Ribs | 
| Ribulose Biphosphate Carboxylase-Oxygenase use Ribulose-Bisphosphate Carboxylase | 
| Ribulose Diphosphate Carboxylase use Ribulose-Bisphosphate Carboxylase | 
| Ribulose-Bisphosphate Carboxylase | 
| Ribulosebiphosphate Carboxylase use Ribulose-Bisphosphate Carboxylase | 
| Ribulosephosphates | 
| Rice use Oryza sativa | 
| Rice Tungro Bacilliform Virus use Tungrovirus | 
| Rice stripe virus use Tenuivirus | 
| Rice tungro spherical virus use Waikavirus | 
| Richter Scale | 
| Ricin | 
| Ricinoleic Acids | 
| Ricinus | 
| Ricinus communis | 
| Rickets | 
| Rickets, Hypophosphatemic use Hypophosphatemic Rickets, X-Linked Dominant | 
| Rickets, Renal use Renal Osteodystrophy | 
| Rickets, Vitamin D-Resistant use Hypophosphatemic Rickets, X-Linked Dominant | 
| Rickets, X-Linked Hypophosphatemic use Hypophosphatemic Rickets, X-Linked Dominant | 
| Rickettsia | 
| Rickettsia Infections | 
| Rickettsia akari | 
| Rickettsia conorii | 
| Rickettsia felis | 
| Rickettsia prowazekii | 
| Rickettsia quintana use Bartonella quintana | 
| Rickettsia rickettsii | 
| Rickettsia tsutsugamushi use Orientia tsutsugamushi | 
| Rickettsia typhi | 
| Rickettsiaceae | 
| Rickettsiaceae Infections | 
| Rickettsial Pneumonia use Pneumonia, Rickettsial | 
| Rickettsial Vaccines | 
| Rickettsialpox use Rickettsiaceae Infections | 
| Rickettsieae | 
| Rickettsiella use Coxiellaceae | 
| Rida use Scrapie | 
| Ridge use Oceanic Ridge | 
| Rietveld Refinement use Least-Squares Analysis | 
| Rifabutin | 
| Rifampicin use Rifampin | 
| Rifampin | 
| Rifamycins | 
| Rifles use Firearms | 
| Rifomycins use Rifamycins | 
| Rift Valley Fever | 
| Rift Valley fever virus | 
| Right Atrial Function use Atrial Function, Right | 
| Right Heart Bypass use Heart Bypass, Right | 
| Right Ventricular Dysfunction use Ventricular Dysfunction, Right | 
| Right Ventricular Dysplasia, Arrhythmogenic use Arrhythmogenic Right Ventricular Dysplasia | 
| Right Ventricular Function use Ventricular Function, Right | 
| Right Ventricular Hypertrophy use Hypertrophy, Right Ventricular | 
| Right Whale Dolphins use Dolphins | 
| Right Whale, Greenland use Bowhead Whale | 
| Right Whale, North Atlantic use Whales | 
| Right Whale, Southern use Whales | 
| Right to Die | 
| Right to Health | 
| Right to Treatment use Patient Rights | 
| Rights of the Handicapped use Handicapped Advocacy | 
| Rightsizing use Personnel Downsizing | 
| Rigidity, Decerebrate use Decerebrate State | 
| Rigidity, Decorticate use Decerebrate State | 
| Rigidity, Muscular use Muscle Rigidity | 
| Rigor Mortis | 
| Riley Virus use Lactate dehydrogenase-elevating virus | 
| Riley-Day Syndrome use Dysautonomia, Familial | 
| Riluzole | 
| Rimantadine | 
| Rinderpest | 
| Rinderpest virus | 
| Ring Chromosomes | 
| Ring Constrictions, Intrauterine use Amniotic Band Syndrome | 
| Ringelman Chart | 
| Ringelman Scale use Ringelman Chart | 
| Ringtails use Procyonidae | 
| Ringworm use Tinea | 
| Rio Muni use Equatorial Guinea | 
| Rioprostil | 
| Riot Control Agents, Chemical | 
| Riots | 
| Rising Tide | 
| Risk | 
| Risk Acceptance use Risk-Taking | 
| Risk Adjustment | 
| Risk Areas Delimitation | 
| Risk Assessment | 
| Risk Behavior use Risk-Taking | 
| Risk Exposure use Risk-Taking | 
| Risk Factors | 
| Risk Grade | 
| Risk Grade I | 
| Risk Grade II | 
| Risk Groups | 
| Risk Groups Nutrition | 
| Risk Index | 
| Risk Management | 
| Risk Map | 
| Risk Rate use Risk Index | 
| Risk Ratio use Odds Ratio | 
| Risk Reduction use Risk Reduction Behavior | 
| Risk Reduction Behavior | 
| Risk Sharing, Financial | 
| Risk Zone | 
| Risk of Biological Agents use Exposure to Biological Agents | 
| Risk-Benefit Assessment use Risk Assessment | 
| Risk-Taking | 
| Risperidone | 
| Risso's Dolphin use Dolphins | 
| Ristocetin | 
| Ritanserin | 
| Ritodrine | 
| Ritonavir | 
| Ritter Disease use Staphylococcal Scalded Skin Syndrome | 
| Rituals use Ceremonial Behavior | 
| Rivea use Convolvulaceae | 
| River Basins | 
| River Bed | 
| River Blindness use Onchocerciasis, Ocular | 
| River Forecast use Hydrological Forecast | 
| River Mouth use Delta | 
| River Otters use Otters | 
| River Pollution | 
| River Water Collection | 
| Rivers | 
| Roach (Fish) use Cyprinidae | 
| Roads | 
| Robenidine | 
| Robenzidene use Robenidine | 
| Robenzidine use Robenidine | 
| Robinia | 
| Robinia pseudacacia | 
| Robins use Songbirds | 
| Robotics | 
| Rochalimaea use Bartonella | 
| Rochalimaea Infections use Bartonella Infections | 
| Rochalimaea henselae use Bartonella henselae | 
| Rochalimaea quintana use Bartonella quintana | 
| Rock Decomposition | 
| Rock Shrimp use Decapoda (Crustacea) | 
| Rock Slide use Landslide | 
| Rocket, Yellow use Barbarea | 
| Rockfall | 
| Rockslide use Rockfall | 
| Rocky Mountain Bighorn Sheep use Sheep, Bighorn | 
| Rocky Mountain Spotted Fever | 
| Rod Outer Segments | 
| Rod Photoreceptors use Rods (Retina) | 
| Rod-Cone Dystrophy use Retinitis Pigmentosa | 
| Rod-Opsin use Opsin | 
| Rodent Control | 
| Rodent Diseases | 
| Rodent Ulcer use Carcinoma, Basal Cell | 
| Rodentia | 
| Rodenticides | 
| Rodents use Rodentia | 
| Rods (Retina) | 
| Rods and Cones use Photoreceptors, Vertebrate | 
| Roentgen Rays use X-Rays | 
| Roentgenkymography use Electrokymography | 
| Roentgenography use Radiography | 
| Roentgenotherapy use X-Ray Therapy | 
| Rogerian Therapy use Nondirective Therapy | 
| Rohypnol use Flunitrazepam | 
| Rolands Epilepsy use Epilepsy, Rolandic | 
| Role | 
| Role Concept use Role | 
| Role Playing | 
| Rolipram | 
| Rolitetracycline | 
| Roller | 
| Rollinia | 
| Romaleidae use Grasshoppers | 
| Roman Chamomile use Anthemis nobilis (Homeopathy) | 
| Roman Empire use Roman World | 
| Roman World | 
| Romania | 
| Romano-Ward Syndrome | 
| Romanomermis use Mermithoidea | 
| Romberg Disease use Facial Hemiatrophy | 
| Rome | 
| Ronidazole | 
| Roniviridae | 
| Rooibos use Aspalathus | 
| Rooming-in Care | 
| Rooms, Patient use Patients' Rooms | 
| Root Canal use Dental Pulp Cavity | 
| Root Canal Filling Materials | 
| Root Canal Irrigants | 
| Root Canal Medicaments use Root Canal Irrigants | 
| Root Canal Obturation | 
| Root Canal Preparation | 
| Root Canal Sealants use Root Canal Filling Materials | 
| Root Canal Therapy | 
| Root Caries | 
| Root Nodules, Plant | 
| Root Planing | 
| Root Resorption | 
| Root Scaling use Dental Scaling | 
| Root Tip use Meristem | 
| Rorippa | 
| Rorschach Test | 
| Rosa | 
| Rosa canina | 
| Rosa centifolia | 
| Rosa damascena | 
| Rosacea | 
| Rosaceae | 
| Rosai-Dorfman Disease use Histiocytosis, Sinus | 
| Rosales | 
| Rosaniline Dyes | 
| Rose use Rosa | 
| Rose Bengal | 
| Rosehips use Rosa | 
| Rosenthal Syndrome use Factor XI Deficiency | 
| Rosenzweig Picture-Frustration Study use Projective Techniques | 
| Roseobacter | 
| Roseola Infantum use Exanthema Subitum | 
| Roseolovirus | 
| Roseolovirus Infections | 
| Roseomonas use Methylobacteriaceae | 
| Roseroot use Rhodiola | 
| Rosette Formation | 
| Rosmarinus | 
| Rosmarinus officinalis | 
| Ross River virus | 
| Rostral Intralaminar Nuclei use Intralaminar Thalamic Nuclei | 
| Rotameters | 
| Rotarod Performance Test | 
| Rotary Disks | 
| Rotary Drilling | 
| Rotary Nystagmus use Nystagmus, Pathologic | 
| Rotary Pumps | 
| Rotation | 
| Rotational Atherectomy use Atherectomy, Coronary | 
| Rotator Cuff | 
| Rotavirus | 
| Rotavirus Infections | 
| Rotavirus Vaccines | 
| Rotaxanes | 
| Rotenone | 
| Rothmund-Thomson Syndrome | 
| Rotifera | 
| Rotifers use Rotifera | 
| Rotor Syndrome use Hyperbilirubinemia, Hereditary | 
| Rouges use Products for Facial Makeup | 
| Rouget Cells use Pericytes | 
| Rough-Toothed Dolphin use Dolphins | 
| Roughage use Dietary Fiber | 
| Round Ligament | 
| Round Window, Ear | 
| Rounded Crested Weirs | 
| Rourea use Connaraceae | 
| Rous Sarcoma use Sarcoma, Avian | 
| Rous sarcoma virus | 
| Rous-Associated Virus use Avian leukosis virus | 
| Rousettus use Chiroptera | 
| Roussy-Levy Syndrome use Charcot-Marie-Tooth Disease | 
| Routine Diagnostic Tests use Diagnostic Tests, Routine | 
| Routing use Flood Routing | 
| Roux-en-Y Anastomosis use Anastomosis, Roux-en-Y | 
| Roux-en-Y Diversion use Anastomosis, Roux-en-Y | 
| Roux-en-Y Loop use Anastomosis, Roux-en-Y | 
| Rowan use Sorbus | 
| Rowson-Parr Virus use Friend murine leukemia virus | 
| Roxarsone | 
| Roxithromycin | 
| Royer Syndrome use Prader-Willi Syndrome | 
| Ruanda use Rwanda | 
| Rubber | 
| Rubber Allergy use Latex Hypersensitivity | 
| Rubber Dams | 
| Rubber Industry | 
| Rubber Silicone use Silicone Elastomers | 
| Rubber Tires use Tires | 
| Rubber Tree use Hevea | 
| Rubberplant use Ficus | 
| Rubefacients use Irritants | 
| Rubella | 
| Rubella Syndrome, Congenital | 
| Rubella Vaccine | 
| Rubella virus | 
| Rubeola use Measles | 
| Rubia | 
| Rubia tinctorum | 
| Rubiaceae | 
| Rubidium | 
| Rubidium Radioisotopes | 
| Rubidomycin use Daunorubicin | 
| Rubinstein-Taybi Syndrome | 
| Rubisco use Ribulose-Bisphosphate Carboxylase | 
| Rubivirus | 
| Rubivirus Infections | 
| Rubomycin use Daunorubicin | 
| Rubredoxins | 
| Rubulavirus | 
| Rubulavirus Infections | 
| Rubus villosus | 
| Ruby Lasers use Lasers, Solid-State | 
| Rudbeckia | 
| Rudbeckia angustifolia use Echinacea angustifolia | 
| Rudbeckia hirta | 
| Rudbeckia purpurea use Echinacea | 
| Rudiviridae | 
| Rudivirus use Rudiviridae | 
| Rudolphi's Rorqual use Balaenoptera | 
| Rue use Ruta | 
| Rue, Goat's use Galega | 
| Rue, Meadow use Thalictrum | 
| Ruellia use Acanthaceae | 
| Ruffini's Corpuscles use Mechanoreceptors | 
| Rufocromomycin use Streptonigrin | 
| Rugby use Football | 
| Rumania use Romania | 
| Rumen | 
| Rumex | 
| Rumex acetosa | 
| Rumex crispus | 
| Rumex obtusifolius use Lapathum acutum | 
| Ruminantia use Ruminants | 
| Ruminants | 
| Rumination Disorders use Feeding and Eating Disorders of Childhood | 
| Ruminococcus | 
| Runaway Behavior | 
| Running | 
| Runoff | 
| Runoff Coefficient | 
| Runt Disease use Graft vs Host Disease | 
| Rupicapra | 
| Ruppia use Alismatidae | 
| Rupture | 
| Rupture, Spontaneous | 
| Rural Communities use Rural Settlements | 
| Rural Development | 
| Rural Economy | 
| Rural Health | 
| Rural Health Services | 
| Rural Hospitals use Hospitals, Rural | 
| Rural Planning | 
| Rural Population | 
| Rural Population Health use Rural Health | 
| Rural Sanitation | 
| Rural Settlements | 
| Rural Water Supply use Water Supply, Rural | 
| Rural Workers | 
| Rural Zones | 
| Rural-Rural Migration use Internal Migration | 
| Rural-Urban Migration | 
| Ruscus | 
| Russell's Viper | 
| Russell's Viper Venom Time use Prothrombin Time | 
| Russia | 
| Russia (Pre-1917) | 
| Russian Orthodoxy use Eastern Orthodoxy | 
| Russian S.F.S.R. use Russia | 
| Russian S.F.S.R., Asian use Siberia | 
| Russian-Japanese War | 
| Russula emetica use Agaricus emeticus | 
| Russula foetens | 
| Rut Behavior use Sexual Behavior, Animal | 
| Ruta | 
| Ruta graveolens | 
| Rutabaga use Brassica napus | 
| Rutaceae | 
| Rutamycin | 
| Ruthenium | 
| Ruthenium Compounds | 
| Ruthenium Radioisotopes | 
| Ruthenium Red | 
| Rutin | 
| Rwanda | 
| RyR1 use Ryanodine Receptor Calcium Release Channel | 
| Ryania | 
| Ryanodine | 
| Ryanodine Receptor Calcium Release Channel | 
| Ryanodine Receptors use Ryanodine Receptor Calcium Release Channel | 
| Rye use Secale cereale | 
| Ryegrass use Lolium | 
| Rymovirus use Potyviridae | 
| rRNA Genes use Genes, rRNA | 
| rRNA Operon | 
| rRNA Promoter use Promoter Regions (Genetics) | 
| rab G-Proteins use rab GTP-Binding Proteins | 
| rab GTP-Binding Proteins | 
| rab GTPases use rab GTP-Binding Proteins | 
| rab1 GTP-Binding Proteins | 
| rab1A GTP-Binding Protein use rab1 GTP-Binding Proteins | 
| rab2 GTP-Binding Protein | 
| rab3 GTP-Binding Proteins | 
| rab3A GTP-Binding Protein | 
| rab4 GTP-Binding Proteins | 
| rab4A GTP-Binding Protein use rab4 GTP-Binding Proteins | 
| rab5 GTP-Binding Proteins | 
| rab5A GTP-Binding Protein use rab5 GTP-Binding Proteins | 
| rac GTP-Binding Proteins | 
| rac Proteins use rac GTP-Binding Proteins | 
| rac1 GTP-Binding Protein | 
| raf Kinases | 
| raf MAP Kinase Kinase Kinases use raf Kinases | 
| ral A GTP-Binding Protein use ral GTP-Binding Proteins | 
| ral GDP Dissociation Stimulator use ral Guanine Nucleotide Exchange Factor | 
| ral GTP-Binding Proteins | 
| ral Guanine Nucleotide Exchange Factor | 
| ralGDS use ral Guanine Nucleotide Exchange Factor | 
| ran GTP-Binding Protein | 
| ran Protein use ran GTP-Binding Protein | 
| rap GTP-Binding Proteins | 
| rap1 GTP-Binding Proteins | 
| rap1A GTP-Binding Protein use rap1 GTP-Binding Proteins | 
| ras GTPase-Activating Proteins | 
| ras Genes use Genes, ras | 
| ras Guanine Nucleotide Exchange Factors | 
| ras Oncogene Protein p21 use Oncogene Protein p21(ras) | 
| ras Proteins | 
| ras Proto-Oncogene Protein p21 use Proto-Oncogene Proteins p21(ras) | 
| ras-GAPs use ras GTPase-Activating Proteins | 
| ras-GRF1 | 
| ras-Related GTPases use Monomeric GTP-Binding Proteins | 
| ras-Related rap Proteins use rap GTP-Binding Proteins | 
| rasGEFs use ras Guanine Nucleotide Exchange Factors | 
| rel Genes use Genes, rel | 
| rel Oncogene Proteins use Oncogene Proteins v-rel | 
| rel Proto-Oncogene Proteins use Proto-Oncogene Proteins c-rel | 
| ret Proto-Oncogene Proteins use Proto-Oncogene Proteins c-ret | 
| rev Gene Products use Gene Products, rev | 
| rev Gene Products, Human Immunodeficiency Virus | 
| rev Genes use Genes, rev | 
| rev Protein use Gene Products, rev | 
| rev-Responsive Element use Genes, env | 
| rex Gene Products use Gene Products, rex | 
| rex Genes use Genes, pX | 
| rex Protein use Gene Products, rex | 
| rho G-Proteins use rho GTP-Binding Proteins | 
| rho GTP-Binding Proteins | 
| rho GTPases use rho GTP-Binding Proteins | 
| rho Small GTP-Binding Proteins use rho GTP-Binding Proteins | 
| rho-Associated Kinase use rho-Associated Kinases | 
| rho-Associated Kinases | 
| rho12 GTP-Binding Protein use rhoA GTP-Binding Protein | 
| rhoA GTP-Binding Protein | 
| rhoB GTP-Binding Protein | 
| rhoGAP2 Protein use Chimerin 1 |