title: Pharmacological effects of morphine on brain-stimulation reward.
mesh_terms: D000818:Animals; D001245:Association Learning / Q000187:drug effects*; D001921:Brain / Q000187:drug effects*; D004558:Electric Stimulation; D007858:Learning / Q000187:drug effects*; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D011916:Rats, Inbred F344; D012653:Self Stimulation / Q000187:drug effects*
chemical_list: D009020:Morphine