. "The chemical reactions and pathways involving amino acids, carboxylic acids containing one or more amino groups, as carried out by individual cells." . . . "amino acid and derivative metabolism" . "cellular amino acid metabolic process" . "amino acid metabolic process" . "cellular amino acid and derivative metabolic process" . "cellular amino acid metabolism" . . . . . . . . . . . . . . . . . . . . . . . . .