title: Blocking and sensory preconditioning effects in morphine analgesic tolerance: support for a Pavlovian conditioning model of drug tolerance.
mesh_terms: D000818:Animals; D003214:Conditioning, Classical; D003463:Cues; D004361:Drug Tolerance; D008297:Male; D008960:Models, Psychological; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D009020:Morphine