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. Author manuscript; available in PMC: 2013 Jul 5.
Published in final edited form as: Eur J Pharmacol. 2012 May 2;686(1-3):50–54. doi: 10.1016/j.ejphar.2012.04.040

Fig. 3.

Fig. 3

Morphine-induced CPP was blunted in mice lacking the μ opioid receptors [MOP (−/−)] compared to their wild-type littermates/controls [MOP (+/+)]. The data represent mean (±S.E.M.) of the amount of time that mice (n = 7 mice per genotype) spent in the drug-paired chamber on each test day. *P<0.05 compared to its respective preconditioning test day.