Discriminative effects of morphine in the pigeon.
D000818:Animals; D010856:Columbidae; D003917:Dextrorphan / Q000494:pharmacology; D004192:Discrimination, Psychological / Q000187:drug effects*; D005793:Generalization, Psychological / Q000187:drug effects; D006801:Humans; D007981:Levorphanol / Q000494:pharmacology; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D009271:Naltrexone / Q000494:pharmacology; D013997:Time Factors
D003917:Dextrorphan; D007981:Levorphanol; D009270:Naloxone; D009271:Naltrexone; D009020:Morphine