Intravenous self-administration of morphine by naive mice.
D000818:Animals; D003216:Conditioning, Operant / Q000187:drug effects*; D005260:Female; D007275:Injections, Intravenous; D051379:Mice; D008813:Mice, Inbred ICR; D009020:Morphine / Q000008:administration & dosage*; D012055:Reinforcement Schedule; D012646:Self Administration
D009020:Morphine