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Mean ± SEM number of horizontal beam breaks in 5 min bins on day 1 and day 10 during 90 min activity trials. Saline (SAL n = 8) or 15 mg/kg cocaine (COC n = 9) injection were given IP at 30 min. * Indicates a significant difference between COC day 1 and COC day 10 (p < 0.05).
