we investigated the effect of systemic administration of gamma-glutamyl l-3,4-dihydroxyphenylalanine ( gamma-glu-dopa ) on catecholamine contents in the brain . gamma-glu-dopa was transformed to dopamine ( da ) in vitro with brain homogenate by the sequential action of gamma-glutamyl transpeptidase and aromatic l-amino acid decarboxylase .
C0007412
catecholamine
C0013030
dopamine