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Removal of D2R signaling does not affect the expression of the clock genes. Per1 (A), Bmal1 (B) and Rev-Erbα (C) mRNA expression levels, rhythmic pattern, and phase were not affected by the removal of the D2R (2-way ANOVA, P > 0.05). Circles represent the means ± SEM (P < 0.05; N = 4–6).
