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more general categories information about this item 10. Biology and Chemistry 10. Biology and Chemistry Biology and Chemistry (144) Biochemistry (39) description: Semantic Types Ontology (STY) consists of broad subject categories, or Semantic Types, that provide a consistent categorization of concepts, and important relationships, or Semantic Relations, that exist between Semantic Types. AFDSI imports STY. complete name: US NCBI UMLS STY