title: Conditioning of morphine-induced enhancement of motor activity.
mesh_terms: D000818:Animals; D003214:Conditioning, Classical; D008124:Locomotion / Q000187:drug effects*; D008297:Male; D008892:Milk; D009020:Morphine / Q000494:pharmacology*; D009043:Motor Activity / Q000187:drug effects*; D051381:Rats; D013016:Sound; D013268:Stimulation, Chemical; D013997:Time Factors
chemical_list: D009020:Morphine