1 the effect of morphine , methionine-enkephalin ( met-enkephalin ) and d-ala2-d-leu5-enkephalin ( dadle ) were tested on the spontaneous and electrically-evoked release of acetylcholine ( ach ) from superfused slices of guinea-pig thalamus , caudate nucleus and cerebral cortex .
C0014295
methionine-enkephalin
C0014298
enkephalin