in this paper , the biosynthesis and release of l-beta-3,4-dihydroxyphenylalanine ( l-dopa ) and dopamine were analyzed in three heterologous cell lines after retroviral-mediated gene transfer of tyrosine hydroxylase ( ec 1.14.16.2 ) , the rate-limiting enzyme in catecholamine synthesis .
C0013023
dihydroxyphenylalanine
C0007412
catecholamine