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Summary of potassium-evoked DA signal amplitude throughout the striatum and nucleus accumbens of animals treated with saline or METH. Experiments were performed at 1 week, 1 month, 6 months, or 12 months after treatment with saline or METH, as indicated in the figure. The data shown are mean ± SEM values for eight animals per group. *p < 0.05 versus saline group at same depth (three-way repeated measures ANOVA followed by Newman–Keuls post hoc comparisons).
