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Total number of photobeam breaks for the males (top panel) and females (bottom panel) during 60 min post-injection of 0.5 mg/kg amphetamine (AMPH) across testing days as a function of exposure group. +Significant difference from 0 mg/kg/day PCB group (p<0.05) on that testing day; *Significant difference from day 2 (p≤0.01).
