intraperitoneal injection of [ 4-36cl , 2-14c ] p-chlorophenylalanine ( pcpa ) ( 300 mg/kg ) in rats revealed absence of chlorine in pure hepatic phenylalanine hydroxyase , while the carbon label appeared a 1 -- 4 moles/mole of [ 14c ] tyrosine in the inactivated phenylalanine and cerebral tryptophan-5-hydroxylase .
C0030135
p-chlorophenylalanine
C0031453
phenylalanine