| A - Anatomy 
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| A18 - Plant Structures 
 
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| B - Organisms 
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| B03 - Bacteria B04 - Viruses
 
 
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| C - Diseases 
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    | C03 - Parasitic Diseases C04 - Neoplasms
 C05 - Musculoskeletal Diseases
 C10 - Nervous System Diseases
 C14 - Cardiovascular Diseases
 C15 - Hemic and Lymphatic Diseases
 C16 - Congenital, Hereditary, and Neonatal Diseases 
      and Abnormalities
 C21 - Disorders of Environmental Origin
 C23 - Pathological Conditions, Signs and Symptoms
 
 
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| D - Chemicals and Drugs 
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    | D02 - Organic Chemicals D04 - Polycyclic Compounds
 D05 - Macromolecular Substances
 D06 - Hormones, Hormone Substitutes, and Hormone Antagonists
 D08 - Enzymes and Coenzymes
 D12 - Amino Acids, Peptides, and Proteins
 
 
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| E - Analytical, Diagnostic and Therapeutic Techniques and Equipment 
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    | E01 - Diagnosis E02 - Therapeutics
 E05 - Investigative Techniques
 E06 - Dentistry
 E07 - Equipment and Supplies
 
 
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| G - Phenomena and Processes 
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    | G01 - Physical Phenomena G05 - Genetic Phenomena
 G07 - Physiological Phenomena
 G11 - Musculoskeletal and Neural Physiological Phenomena
 G16 - Biological Phenomena
 
 
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| H - Disciplines and Occupations 
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    | H01 - Natural Science Disciplines H02 - Health Occupations
 
 
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| HP - Homeopathy 
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| HP4 - Materia Medica 
 
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| I - Anthropology, Education, Sociology and Social Phenomena 
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| I01 - Social Sciences 
 
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| L - Information Science 
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| L01 - Information Science 
 
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| N - Health Care 
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| N06 - Environment and Public Health 
 
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| SP - Public Health 
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| SP8 - Disasters 
 
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| VS - Health Surveillance 
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    | VS1 - Health Surveillance System VS2 - Health Surveillance of Products
 
 
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| Z - Geographicals 
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| Z01 - Geographic Locations 
 
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