the delta-opioid-receptor selective agonist [ d-pen2 , d-pen5 ] enkephalin mimicked the inhibitory effects of [ met ] enkephalin and inhibition by [ d-pen2 , d-pen5 ] enkephalin was antagonized by the delta-opioid-receptor antagonist , ici 174,864 .
C0014295
met ] enkephalin
C0014298
enkephalin