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Mean sniffing counts (±SEM) of saline- and amphetamine-treated rats tested on postnatal day (PD) 21 (i.e., one day after conclusion of the drug pretreatment regimen). These are the same rats as described in Figure 1.
‡ Significantly different from the vehicle group when collapsed across time blocks 1–6 (Pretreatment Condition main effect, p < 0.05).
