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Nucleus accumbens dopamine concentrations in rats self-administering intravenous doses (0.25 mg/kg per injection) of d-amphetamine. Dialysate samples were collected at 15 min intervals before the start of the self-administration session at time = 0 (baseline) and at 5 min intervals after the start of the session. Vertical dotted lines represent lever presses and associatedd-amphetamine infusions. DL numbers are rat identification numbers.
