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Left; Average number of infusions of 0.032 mg/kg/infusion MDPV (inverted triangles) and saline (filled circles) when MDPV and saline were concurrently available. Right; Average number of infusions of 0.71 mg/kg/infusion cocaine (circles) and saline (filled inverted triangles) when cocaine and saline were concurrently available. Data represent the mean ±S.E.M., and each point represents 18 rats.
