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. Author manuscript; available in PMC: 2015 Oct 10.
Published in final edited form as: Neuroscience. 2014 Aug 20;278:154–164. doi: 10.1016/j.neuroscience.2014.08.008

Fig. 3.

Fig. 3

Acquisition of intravenous cocaine self-administration in D3 receptor mutant mice and wild-type littermates. Day 1–5: FR1 schedule of cocaine reinforcement, and day 6–15: FR2 schedule of cocaine reinforcement. N = 14–18 mice for each group. Data represent mean ± SEM. *P<0.05, **P<0.01, and ***P<0.001 active versus inactive nose-pokes. #P<0.05 active nose-pokes in D3 receptor mutant versus those in wild-type mice.