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Social behaviors in D1–CB1−/− mice. Conditional D1–CB1−/− mutant mice (KO) and their respective wild-type (WT) littermates were tested in the social interaction (A,B) or in the social investigation (C,D) test. Data are presented as mean ± SEM regarding time in interaction and number of interactions. E1: empty tube 1; E2: empty tube 2; F1: tube with female. *p < 0.05, **p < 0.01, ***p < 0.01 (Newman–Keuls post hoc test or unpaired t-test).
