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Average number of infusions of 0.032 mg/kg/infusion of MDPV (inverted triangles) and 0.71 mg/kg/infusion of cocaine (circles) when MDPV and cocaine were concurrently available on the group level (left; n=18), and in rats categorized as MDPV-preferring (center; n=10) and cocaine-preferring (right; n=8). Data represent the mean ±S.E.M.
