leu- and met-enkephalin , which are co-stored with adrenaline in the bovine adrenal medullary cells produce a non-specific inhibition of the nicotine-evoked release of ca , but enhance the basal release of endogenous catecholamines by a mechanism that is ca2+-dependent , stereospecific and reversible by naloxone and naltrexone .
C0027358
naloxone
C0027360
naltrexone