Anatomy|A|357747
Organisms|B|392381
Diseases|C|537255
Chemicals and Drugs|D|980930
Analytical, Diagnostic and Therapeutic Techniques and Equipment|E|877038
Psychiatry and Psychology|F|185296
Biological Sciences|G|1024627
Physical Sciences|H|383770
Anthropology, Education, Sociology and Social Phenomena|I|109299
Technology and Food and Beverages|J|45889
Humanities|K|27983
Information Science|L|149576
Persons|M|388012
Health Care|N|529399
Geographic Locations|Z|94882

Body Regions|A01|14835
Musculoskeletal System|A02|32999
Digestive System|A03|20192
Respiratory System|A04|8780
Urogenital System|A05|18956
Endocrine System|A06|8560
Cardiovascular System|A07|30369
Nervous System|A08|63992
Sense Organs|A09|11155
Tissues|A10|36849
Cells|A11|147720
Fluids and Secretions|A12|10601
Animal Structures|A13|4434
Stomatognathic System|A14|10618
Hemic and Immune Systems|A15|38548
Embryonic Structures|A16|9895
Integumentary System|A17|4233
Animals|B01|297054
Algae|B02|1217
Bacteria|B03|34290
Viruses|B04|19529
Fungi|B05|10248
Plants|B06|30931
Archaea|B07|855
Bacterial Infections and Mycoses|C01|33011
Virus Diseases|C02|24145
Parasitic Diseases|C03|8223
Neoplasms|C04|114060
Musculoskeletal Diseases|C05|21483
Digestive System Diseases|C06|41405
Stomatognathic Diseases|C07|12609
Respiratory Tract Diseases|C08|28078
Otorhinolaryngologic Diseases|C09|8029
Nervous System Diseases|C10|67586
Eye Diseases|C11|14089
Urologic and Male Genital Diseases|C12|23527
Female Genital Diseases and Pregnancy Complications|C13|20358
Cardiovascular Diseases|C14|67171
Hemic and Lymphatic Diseases|C15|19297
Congenital, Hereditary, and Neonatal Diseases and Abnormalities|C16|23483
Skin and Connective Tissue Diseases|C17|20371
Nutritional and Metabolic Diseases|C18|25853
Endocrine Diseases|C19|27839
Immunologic Diseases|C20|34284
Disorders of Environmental Origin|C21|31489
Animal Diseases|C22|14743
Pathological Conditions, Signs and Symptoms|C23|116893
Inorganic Chemicals|D01|72652
Organic Chemicals|D02|99941
Heterocyclic Compounds|D03|67141
Polycyclic Hydrocarbons|D04|25644
Hormones, Hormone Substitutes, and Hormone Antagonists|D06|28765
Reproductive Control Agents|D07|1184
Enzymes and Coenzymes|D08|100144
Carbohydrates and Hypoglycemic Agents|D09|37881
Lipids|D10|30924
Growth Substances, Pigments, and Vitamins|D11|26545
Amino Acids, Peptides, and Proteins|D12|306047
Nucleic Acids, Nucleotides, and Nucleosides|D13|63609
Neurotransmitters and Neurotransmitter Agents|D14|33207
Central Nervous System Agents|D15|14474
Peripheral Nervous System Agents|D16|6025
Anti-Inflammatory Agents, Antirheumatic Agents, and Inflammation Mediators|D17|13831
Cardiovascular Agents|D18|8000
Hematologic, Gastrointestinal, and Renal Agents|D19|6581
Complex Mixtures|D20|8642
Anti-Allergic and Respiratory System Agents|D21|1459
Antineoplastic and Immunosuppressive Agents|D22|16289
Dermatologic Agents|D23|967
Immunologic and Biological Factors|D24|133785
Biomedical and Dental Materials|D25|16427
Pharmaceutical Preparations|D26|17354
Chemical Actions and Uses|D27|158954
Diagnosis|E01|202272
Therapeutics|E02|97183
Anesthesia and Analgesia|E03|5247
Surgical Procedures, Operative|E04|83403
Investigative Techniques|E05|532265
Dentistry|E06|14674
Equipment and Supplies|E07|31170
Behavior and Behavior Mechanisms|F01|89820
Psychological Phenomena and Processes|F02|54884
Mental Disorders|F03|29572
Behavioral Disciplines and Activities|F04|21004
Biological Sciences|G01|28815
Health Occupations|G02|31034
Environment and Public Health|G03|363267
Biological Phenomena, Cell Phenomena, and Immunity|G04|120516
Genetic Processes|G05|74535
Biochemical Phenomena, Metabolism, and Nutrition|G06|171987
Physiological Processes|G07|67723
Reproductive and Urinary Physiology|G08|38383
Circulatory and Respiratory Physiology|G09|39290
Digestive, Oral, and Skin Physiology|G10|6246
Musculoskeletal, Neural, and Ocular Physiology|G11|58216
Chemical and Pharmacologic Phenomena|G12|50583
Genetic Phenomena|G13|67616
Genetic Structures|G14|66137
Natural Sciences|H01|383770
Social Sciences|I01|74657
Education|I02|24332
Human Activities|I03|10425
Technology, Industry, and Agriculture|J01|27403
Food and Beverages|J02|18486
Humanities|K01|27983
Information Science|L01|149576
Persons|M01|388012
Population Characteristics|N01|59665
Health Care Facilities, Manpower, and Services|N02|75251
Health Care Economics and Organizations|N03|59176
Health Services Administration|N04|106004
Health Care Quality, Access, and Evaluation|N05|322311
Geographic Locations|Z01|94882