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Figure 10: Total number of infusions during PR responding for the 0.05, 0.1, and 0.2 mg/kg/infusion doses of MDPV (n = 9 for each group) and 0.05 mg/kg/infusion methamphetamine (n=9). The left y-axis shows the total number of infusions during the PR session and the right y-axis shows the total number of active lever presses completed [*p ................
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