title: Morphine preference of alcohol-avoiding and alcohol-preferring C57BL mice.
mesh_terms: D000428:Alcohol Drinking; D000818:Animals; D004327:Drinking Behavior; D005838:Genotype; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009020:Morphine; D012439:Saccharin
chemical_list: D009020:Morphine; D012439:Saccharin