| A - Anatomy 
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| A02 - Musculoskeletal System A03 - Digestive System
 A06 - Endocrine System
 A09 - Sense Organs
 A10 - Tissues
 
 
 
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| B - Organisms 
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| B01 - Animals B03 - Bacteria
 B04 - Viruses
 B05 - Fungi
 B06 - Plants
 
 
 
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| C - Diseases 
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| C01 - Bacterial Infections and Mycoses C04 - Neoplasms
 C05 - Musculoskeletal Diseases
 C08 - Respiratory Tract Diseases
 C10 - Nervous System Diseases
 C11 - Eye Diseases
 C12 - Urologic and Male Genital Diseases
 C13 - Female Genital Diseases and Pregnancy Complications
 C16 - Congenital, Hereditary, and Neonatal Diseases and Abnormalities
 C17 - Skin and Connective Tissue Diseases
 
 
 
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| D - Chemicals and Drugs 
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| D01 - Inorganic Chemicals D02 - Organic Chemicals
 D03 - Heterocyclic Compounds
 D06 - Hormones, Hormone Substitutes, and Hormone Antagonists
 D08 - Enzymes and Coenzymes
 D09 - Carbohydrates
 D12 - Amino Acids, Peptides, and Proteins
 
 D23 - Biological Factors| Complement |  | Complement System Proteins |  | Complement 1 |  | Complement C1 |  | Complement 1 Inactivators |  | Complement C1 Inactivator Proteins |  | Complement 1q |  | Complement C1q |  | Complement 2 |  | Complement C2 |  | Complement 3 |  | Complement C3 |  | Complement 3 Nephritic Factor |  | Complement C3 Nephritic Factor |  | Complement 3a |  | Complement C3a |  | Complement 3b |  | Complement C3b |  | Complement 3b Inactivators |  | Complement C3b Inactivator Proteins |  | Complement 3c |  | Complement C3c |  | Complement 3d |  | Complement C3d |  | Complement 4 |  | Complement C4 |  | Complement 4a |  | Complement C4a |  | Complement 4b |  | Complement C4b |  | Complement 5 |  | Complement C5 |  | Complement 5a |  | Complement C5a |  | Complement 5a, des-Arginine |  | Complement C5a, des-Arginine |  | Complement 6 |  | Complement C6 |  | Complement 7 |  | Complement C7 |  | Complement 8 |  | Complement C8 |  | Complement 9 |  | Complement C9 |  | Complement Inactivators |  | Complement Inactivator Proteins |  | DNA-Binding Protein, Cyclic AMP-Responsive |  | Cyclic AMP Response Element-Binding Protein |  | Gamma-Globulins |  | gamma-Globulins |  | Heat-Shock Proteins 70 |  | HSP70 Heat-Shock Proteins |  | Heat-Shock Proteins 90 |  | HSP90 Heat-Shock Proteins |  | I-kappa B |  | I-kappa B Proteins |  | Immunoglobulin Constant Region |  | Immunoglobulin Constant Regions |  | Immunoglobulin Inv Allotypes |  | Immunoglobulin Km Allotypes |  | Immunoglobulins, Fab |  | Immunoglobulin Fab Fragments |  | Immunoglobulins, Fc |  | Immunoglobulin Fc Fragments |  | Immunoglobulins, Heavy-Chain |  | Immunoglobulin Heavy Chains |  | Immunoglobulins, J-Chain |  | Immunoglobulin J-Chains |  | Immunoglobulins, Light-Chain |  | Immunoglobulin Light Chains |  | Immunoglobulins, alpha-Chain |  | Immunoglobulin alpha-Chains |  | Immunoglobulins, delta-Chain |  | Immunoglobulin delta-Chains |  | Immunoglobulins, epsilon-Chain |  | Immunoglobulin epsilon-Chains |  | Immunoglobulins, gamma-Chain |  | Immunoglobulin gamma-Chains |  | Immunoglobulins, kappa-Chain |  | Immunoglobulin kappa-Chains |  | Immunoglobulins, lambda-Chain |  | Immunoglobulin lambda-Chains |  | Immunoglobulins, mu-Chain |  | Immunoglobulin mu-Chains |  | Nuclear Localization Signal |  | Nuclear Localization Signals |  | Opsonins |  | Opsonin Proteins |  | Protein p16 |  | Cyclin-Dependent Kinase Inhibitor p16 |  | Protein p53 |  | Tumor Suppressor Protein p53 |  | Transcription Factor, Sp1 |  | Sp1 Transcription Factor |  | p14ARF Protein |  | Tumor Suppressor Protein p14ARF | 
 D27 - Chemical Actions and Uses
 
 
 
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| E - Analytical, Diagnostic and Therapeutic Techniques and Equipment 
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| E02 - Therapeutics E04 - Surgical Procedures, Operative
 E05 - Investigative Techniques
 E07 - Equipment and Supplies
 
 
 
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| G - Biological Sciences 
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| G04 - Biological Phenomena, Cell Phenomena, and Immunity G05 - Genetic Processes
 G06 - Biochemical Phenomena, Metabolism, and Nutrition
 G14 - Genetic Structures
 
 
 
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| H - Physical Sciences 
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| H01 - Natural Sciences 
 
 
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| SP - Public Health 
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| SP1 - Health Policy, Planning and Management SP2 - Health Care (Public Health)
 SP3 - Population Studies in Public Health
 SP4 - Environmental Health
 SP5 - Epidemiology and Biostatistics
 SP6 - Nutrition
 SP7 - Health Sector Reform
 
 
 
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| VS - Health Surveillance 
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| VS2 - Health Surveillance of Products 
 
 
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