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Representative actograms and periodograms of female WT (A, C) and VIP−/− (B, D) mice under LD and DD conditions. A, C: Wheel-running activity records are double plotted and gray shading on the actograms denotes lights off. B, D: Plot of power of activity as a function of period (%V) under DD. The diagonal line represents 0.1% significance level.
