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Discriminative stimulus effects of 2-BFI in rats discriminating 5.6 mg/kg 2-BFI from its vehicle (n = 8). Top: substitution profiles of I2 receptor agonists. Bottom: response rate. Ordinates: top, percentage of 2-BFI-appropropriate lever responding; bottom, response rate as compared to no treatment control. Abscissa: doses (mg/kg). *P < 0.05 as compared to “V”.
