title: Behavioral, pharmacologic and neurobiologic variables important to the analysis of drug self-administration: implications for the discovery of potential pharmacotherapies.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D003042:Cocaine / Q000494:pharmacology*; D003932:Heroin / Q000494:pharmacology; D009294:Narcotics / Q000494:pharmacology*; D012646:Self Administration
chemical_list: D009294:Narcotics; D003932:Heroin; D003042:Cocaine