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Levels of the total, non-protein, and protein –SH groups in the presence of cocaine (A,C,E) and after 10 days of drug abstinence with extinction training (B,D,F) in the kidneys of rats self-administering cocaine (SA), receiving passive cocaine infusions (YC), and receiving saline infusions (YS): data are presented as the mean ± SEM, n = 8–10 per group. * p < 0.05, ** p < 0.01, *** p < 0.001 vs. YS group.
