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. Author manuscript; available in PMC: 2007 Dec 3.
Published in final edited form as: Eur J Pharmacol. 2006 Sep 12;551(1-3):76–79. doi: 10.1016/j.ejphar.2006.08.082

Figure 1.

Figure 1

Mean number of food cup entries exhibited by vehicle-treated rats and nicotine-treated rats on each trial type across training days. R=reinforced trials, NR=non-reinforced trials. Data are means +/− S.E.M.