tyrosine ( tyr ) , tyrosine hydroxylase ( th ) , tryptophan ( trp ) , serotonin ( 5-ht ) , and 5-hydroxyindole acetic acid ( 5-hiaa ) were assayed spectrofluorometrically and radioenzymatically in various regions of post-mortem brains of human patients with hepatic , uremic , and diabetic coma , liver cirrhosis without coma , and hepatic coma treated with parenteral administration of l-valine , a branched-chain amino acid .
C0042285
valine
C0002521
branched-chain amino acid