acutely , morphine and d-ala2-d-leu-enkephalin ( dadle ) inhibited adenylate cyclase in vitro in locus coeruleus ( lc ) , dorsal raphe , frontal cortex and neostriatum and the inhibition by each agonist was blocked by the opiate-receptor antagonist naloxone .
C0014294
leu-enkephalin
C0079286
dadle