title: Proceedings: Brain acetylcholine levels and nociceptive threshold in frogs after the administration of morphine, nalorphine and naloxone.
mesh_terms: D000109:Acetylcholine / Q000378:metabolism*; D000818:Animals; D001001:Anura; D001921:Brain / Q000378:metabolism*; D001923:Brain Chemistry / Q000187:drug effects; D009020:Morphine / Q000494:pharmacology*; D009269:Nalorphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology*; D010146:Pain; D011893:Rana esculenta
chemical_list: D009270:Naloxone; D009020:Morphine; D000109:Acetylcholine; D009269:Nalorphine