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Figure 1: Intravenous self-administration (IVSA) of methylone. Data presented are active and inactive lever presses across the first 21 days of IVSA sessions for the (a) 0.05 (b) 0.1 (c) 0.2 and (d) 0.5 mg/kg/infusion groups (n = 12 for 0.05 and 0.5 mg/kg/infusion groups; n = 11 for the 0.1 and 0.2 mg/kg/infusion groups). *p<0.05 between active and inactive lever presses.
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