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Drug and Alcohol Dependence 156 (2015) e183–e245 e237 However, a small subgroup of participants exhibited a worsening course, characterizedby the initiationofheroinuseand/or injection opioid use. Financial support: NIDA grants U10 DA15831. http://dx.doi.org/10.1016/j.drugalcdep.2015.07.637 Sex differences in dopamine and serotonin activation of brain pathways in adolescent rats exposed to social partners or amphetamine Virginia G. Weiss1,∗, Rebecca S. Hofford1, Justin R. Yates2, Michael T. Bardo1 1 University of Kentucky, Lexington, KY, United States 2 Northern Kentucky University, Newport, KY, United |