Physical Entity - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

        Organism
            Plant
                Alga
            Fungus
            Virus
            Rickettsia or Chlamydia
            Bacterium
            Archaeon
            Animal
                Invertebrate
                Vertebrate
                    Amphibian
                    Bird
                    Fish
                    Reptile
                    Mammal
                        Human
        Anatomical Structure
            Embryonic Structure
            Anatomical Abnormality
                Congenital Abnormality
                Acquired Abnormality
            Fully Formed Anatomical Structure
                Body Part, Organ, or Organ Component
                Tissue
                Cell
                Cell Component
                Gene or Genome
        Manufactured Object
            Medical Device
            Research Device
            Clinical Drug
        Substance
            Chemical
                Chemical Viewed Functionally
                    Pharmacologic Substance
                        Antibiotic
                    Biomedical or Dental Material
                    Biologically Active Substance
                        Neuroreactive Substance or Biogenic Amine
                        Hormone
                        Enzyme
                        Vitamin
                        Immunologic Factor
                        Receptor
                    Indecator, Reagent, or Diagnostic Acid
                    Hazardous or Poisonous Substance
                Chemical Viewed Structurally
                    Organic Chemical
                        Nucleic Acid, Nucleoside, or Nucleotide
                        Organophosphorus Compound
                        Amino Acid, Peptide, or Protein
                        Carbohydrate
                        Lipid
                             Steroid
                             Eicosanoid
                    Inorganic Chemical
                    Element, Ion, or Isotope
            Body Substance
            Food

    Conceptual Entity
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        Idea or Concept
            Temporal Concept
            Qualitative Concept
            Quantitative Concept
            Functional Concept
                Body System
            Spatial Concept
                Body Space or Junction
                Body Location or Region
                Molecular Sequence
                    Nucleotide Sequence
                    Amino Acid Sequence
                    Carbohydrate Sequence
                Geographic Area
        Finding
            Laboratory or Test Result
            Sign or Symptom
        Organism Attribute
            Clinical Attribute
        Intellectual Product
            Classification
            Regulation or Law
        Language
        Occupation or Discipline
            Biomedical Occupation or Discipline
        Organization
            Health Care Related Organization
            Professional Society
            Self-help or Relief Organization
        Group Attribute
        Group
            Professional or Occupational Group
            Population Group
            Family Group
            Age Group
            Patient or Disabled Group

   Activity - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

        Behavior
            Social Behavior
            Individual Behavior
        Daily or Recreational Activity
        Occupational Activity
            Health Care Activity
                Laboratory Procedure
                Diagnostic Procedure
                Therapeutic or Preventive Procedure
            Research Activity
                Molecular Biology Research Technique
            Governmental or Regulatory Activity
            Educational Activity
        Machine Activity

    Phenomenon or Process
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       Human-caused Phenomenon or Process
            Environmental Effect of Humans
        Natural Phenomenon or Process
            Biologic Function
                Physiologic Function
                    Organism Function
                        Mental Process
                    Organ or Tissue Function
                    Cell Function
                    Molecular Function
                        Genetic Function
                Pathologic Function
                    Disease or Syndrome
                        Mental or Behavioral Dysfunction
                        Neoplastic Process
                    Cell or Molecular Dysfunction
                    Experimental Model or Disease
        Injury or Poisoning

    Relation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

        isa
        associated_with
            physically_related_to
                part_of
                consists_of
                contains
                connected_to
                interconnects
                branch_of
                tributary_of
                ingredient_of
            spatially_related_to
                location_of
                adjacent_to
                surrounds
                traverses
            functionally_related_to
                affects
                     manages
                     treats
                     disrupts
                     complicates
                     interacts_with
                     prevents
                brings_about
                     produces
                     causes
                performs
                     carries_out
                     exhibits
                     practices
                 occurs_in
                     process_of
                 users
                 manifestation_of
                 indicates
                 result_of
            temporally_related_to
                 co occurs_with
                 precedes
            conceptually_related_to
                 evaluation_of
                 degree_of
                 analyzes
                     assesses_effect_of
                 measurement_of
                 measures
                 diagnoses
                 property_of
                 derivative_of
                 developmental_form_of
                 method_of
                 conceptual_part_of
                 issue_in