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Effect of GBR12909 pretreatment on the elevation of extracellular DA by 1.0 mg/kg i.v. cocaine. DA levels are mean±SEM expressed as a percentage of three baseline samples obtained before treatment (n=6 rats/group). GBR12909 (0.3 or 1.0 mg/kg i.v.) or saline was administered 60 min before cocaine challenge given at time 0. *p<0.05 with respect to the corresponding saline pretreatment group. From: [30].
