bovine pineal tryptophan hydroxylase is a pterin-dependent aromatic amino acid monooxygenase with a broad substrate specificity and with low km values for the amino acid substrates , l-tryptophan and l-phenylalanine . p-chlorophenylalanine , an inhibitor of the tryptophan hydroxylation in the brain , also serves as a good substrate of the bovine pineal enzyme .
C0301713
aromatic amino acid
C0041249
tryptophan