title: Discriminative stimulus effects of naltrexone in narcotic-naive and morphine-treated pigeons.
mesh_terms: D000818:Animals; D010856:Columbidae; D003216:Conditioning, Operant / Q000187:drug effects; D004193:Discrimination Learning / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D009021:Morphine Dependence; D009270:Naloxone / Q000031:analogs & derivatives*; D009271:Naltrexone / Q000494:pharmacology*
chemical_list: D009270:Naloxone; D009271:Naltrexone