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Dose-response curves for cocaine (n=5),GBR 12909 (n=6), and desipramine (n=5) in animals trained to discriminate 0.5 mg/kg MDPV from saline. Percentage MDPV-lever responses (closed symbols) refers to the left Y-axis and response rate (open symbols) refers to the right Y-axis. Individual points represent the group mean (± SEM). Statistically significant Dunnett’s tests compared to saline are indicated by * (P < 0.05).
