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Effects of photic intensity on circadian period and onset variability. A, Representative actograms show the intensity-dependent lengthening of period in LL. Open circles indicate the time of sham surgery or GDX in DD. B and C, Quantification of the effects of endocrine status on circadian period (B) and the sd of activity onset (C) in DD and three intensities of LL. *, P < 0.05, Tukey test.
