--subdivisions Metabolism--Regulation, Secretion--Regulation, and Synthesis--Regulation under individual chemicals and groups 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
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