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Effect of NAC on extinction responding in animals trained to self-administer cocaine. Data are shown as mean ± sem per two hour training session. Self-Administration (SA INF) is represented as mean infusions; for extinction trials, data are shown as mean ± sem active lever presses. *p< 0.05; significance level pertains to the comparison of the overall main effect between NAC and Saline across all 7 days of extinction training.
