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Mean (+SEM) distance traveled (cm) by young rats (n = 9 per group) tested after a 14- or 21-day interval (i.e., on PD 33 or PD 40). Data shown are collapsed across the 90-min testing session. U-15 = Unpaired group-15 mg/kg cocaine; P-15 = Paired group-15 mg/kg cocaine; U-30 = Unpaired group-30 mg/kg cocaine; P-30 = Paired group-30 mg/kg cocaine.
