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There were no differences between STs (n = 24) and GTs (n = 18) in the acquisition of cocaine acquisition in Experiment 2 as indicated by (A) number of active and inactive responses, and (B) number of cocaine infusion/min for infusion criteria 5 and 10 (0.4 mg/kg/inf), and 20 and 40 (0.2 mg/kg/inf). Values represent means ± SEM.
