| A - ANATOMY 
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| A03 - DIGESTIVE SYSTEM A07 - CARDIOVASCULAR SYSTEM
 A10 - TISSUES
 A11 - CELLS
 A12 - FLUIDS AND SECRETIONS
 
 
 
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| B - ORGANISMS 
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| B01 - INVERTEBRATES B03 - BACTERIA
 B04 - VIRUSES
 B05 - ALGAE AND FUNGI
 B06 - PLANTS
 
 
 
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| C - DISEASES 
 | Changed terms |  | Replaced-by | 
 
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| C01 - BACTERIAL INFECTIONS AND MYCOSES C04 - NEOPLASMS
 C06 - DIGESTIVE SYSTEM DISEASES
 C08 - RESPIRATORY TRACT DISEASES
 C14 - CARDIOVASCULAR DISEASES
 C16 - CONGENITAL, HEREDITARY, AND NEONATAL DISEASES AND ABNORMALITIES
 C17 - SKIN AND CONNECTIVE TISSUE DISEASES
 C18 - NUTRITIONAL AND METABOLIC DISEASES
 
 
 
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| D - CHEMICALS AND DRUGS 
 | Changed terms |  | Replaced-by | 
 
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| D02 - ORGANIC CHEMICALS D03 - HETEROCYCLIC COMPOUNDS
 D04 - POLYCYCLIC HYDROCARBONS
 D06 - HORMONES, HORMONE SUBSTITUTES, AND HORMONE ANTAGONISTS
 D08 - ENZYMES, COENZYMES, AND ENZYME INHIBITORS
 D10 - LIPIDS AND ANTILIPEMIC AGENTS
 D12 - AMINO ACIDS, PEPTIDES, AND PROTEINS
 D24 - IMMUNOLOGIC AND BIOLOGICAL FACTORS
 D27 - CHEMICAL ACTIONS AND USES
 
 
 
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| E - ANALYTICAL, DIAGNOSTIC AND THERAPEUTIC TECHNIQUES AND EQUIPMENT 
 | Changed terms |  | Replaced-by | 
 
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| E01 - DIAGNOSIS E02 - THERAPEUTICS
 E05 - INVESTIGATIVE TECHNIQUES
 
 
 
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| F - PSYCHIATRY AND PSYCHOLOGY 
 | Changed terms |  | Replaced-by | 
 
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| F01 - BEHAVIOR AND BEHAVIOR MECHANISMS 
 
 
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| G - BIOLOGICAL SCIENCES 
 | Changed terms |  | Replaced-by | 
 
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| G09 - CIRCULATORY AND RESPIRATORY PHYSIOLOGY G11 - MUSCULOSKELETAL, NEURAL, AND OCULAR PHYSIOLOGY
 G14 - GENETIC STRUCTURES
 
 
 
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| M - PERSONS 
 | Changed terms |  | Replaced-by | 
 
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| M01 - PERSONS 
 
 
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| N - HEALTH CARE 
 | Changed terms |  | Replaced-by | 
 
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| N02 - HEALTH CARE FACILITIES, MANPOWER, AND SERVICES 
 
 
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