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Cocaine conditioned place preference is similar in D1-GFP, and D2-GFP hemizygotes and littermate controls. CPP score in wild-type (D1-GFP −/−) littermates (n=4 saline, n=7 cocaine); D1-GFP +/− (n=7 saline, n=10 cocaine), wild-type (D2-GFP −/−) littermates (n=4 saline, n=6 cocaine); and D2-GFP +/− (n=5 saline, n=6 cocaine).
