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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2015 Sep 25;156:228–233. doi: 10.1016/j.drugalcdep.2015.09.011

Figure 2.

Figure 2

Mean (± SEM) number of lever presses for the same vehicle-treated reinstatement group shown in Figure 1 and a group lever pressing under a progressive ratio schedule of food reinforcement and treated with the 15 mg/kg dose of SR 21502 .