title: Psychogenetics of drug seeking behavior.
mesh_terms: D000818:Animals; D003192:Compulsive Behavior / Q000235:genetics; D004723:Endorphins / Q000172:deficiency; D006801:Humans; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D019966:Substance-Related Disorders / Q000235:genetics*
chemical_list: D004723:Endorphins