Effect of training on the analgesics action of morphine.
D000698:Analgesia; D000818:Animals; D003213:Conditioning, Psychological / Q000187:drug effects*; D004558:Electric Stimulation; D006140:Guaifenesin / Q000494:pharmacology; D008297:Male; D051379:Mice; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*; D010424:Pentobarbital / Q000494:pharmacology; D013623:Tail
D006140:Guaifenesin; D009020:Morphine; D010424:Pentobarbital