mif-1 ( pro-leu-gly-nh2 ) , a hypothalamic tripeptide , has been demonstrated to stimulate naloxone in antagonizing the effects of opioid peptides in a number of experimental systems including enkephalin-induced analgesia in the tail-flick assay , beta-endorphin induced hypothermia and hypomotility , deprivation-induced drinking , and analgesia in goldfish .
C0205753
opioid peptides
C0014298
enkephalin