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. 2010 Apr 27;211(1):33–42. doi: 10.1007/s00213-010-1868-x

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© The Author(s) 2010

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Fig. 3 — The effects of MPEP on the response-enhancing effects of nicotine. Saline and nicotine (0.4 mg/kg, s.c.) treated rats (N = 8 in each group) were trained in an operant task (FR2:TO20) reinforced by a stimulus light above the active lever and extinguishing the house light. The bars represent means ± SEM for the lever-pressing responses on the active lever (panel A) and the inactive lever (panel B)