title: Human beta-endorphin: development of tolerance and behavioral activity in rats.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D004361:Drug Tolerance; D006801:Humans; D007700:Kinetics; D008297:Male; D009020:Morphine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology; D009294:Narcotics; D010455:Peptides / Q000494:pharmacology*; D051381:Rats
chemical_list: D009294:Narcotics; D010455:Peptides; D009270:Naloxone; D009020:Morphine