title: Letter: Fragment of sheep beta-lipotropin with morphine-like activity.
mesh_terms: D000818:Animals; D004336:Drug Antagonism; D008297:Male; D051379:Mice; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009270:Naloxone / Q000494:pharmacology; D009842:Oligopeptides / Q000494:pharmacology*; D010902:Pituitary Gland; D012756:Sheep; D014649:Vas Deferens / Q000187:drug effects; D008083:beta-Lipotropin / Q000037:antagonists & inhibitors / Q000494:pharmacology*
chemical_list: D009842:Oligopeptides; D009270:Naloxone; D008083:beta-Lipotropin