title: Effect on perception and reaction to pain in opiate analgesia.
mesh_terms: D000698:Analgesia; D000701:Analgesics, Opioid / Q000494:pharmacology*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D004744:Enkephalin, Methionine / Q000031:analogs & derivatives / Q000494:pharmacology; D005260:Female; D008297:Male; D051379:Mice; D009020:Morphine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology; D010146:Pain / Q000503:physiopathology*
chemical_list: D000701:Analgesics, Opioid; D009270:Naloxone; D004744:Enkephalin, Methionine; C032818:enkephalinamide-Met, Ala(2)-N-Me(5)-; D009020:Morphine