pretreatment of the animals with 6-hydroxydopamine , which destroys central catecholamine-containing nerve terminals , substantially reduced the release of dopamine synthesized from [ ( 14 ) c ] tyrosine or from a low concentration of [ ( 3 ) h ] dopa , whereas the release of dopamine formed from a high concentration of [ ( 3 ) h ] dopa remained essentially unchanged .
C0007412
catecholamine
C0013023
dopa