--subdivision Biodegradation under individual chemicals and groups of chemicals, substances and materials, e.g. Insulin--Biodegradation; Insecticides--Biodegradation; Metals--Biodegradation
--subdivisions Metabolism--Regulation, Secretion--Regulation, and Synthesis--Regulation under individual chemicals and types of chemicals, e.g. Copper--Metabolism--Regulation; Copper--Secretion--Regulation; Insulin--Synthesis--Regulation; and subdivision Vocalization--Regulation under individual animals and groups of animals, e.g. Mammals--Vocalization--Regulation; Cattle--Vocalization--Regulation
