In organisms as diverse as fruit flies and mammals, circadian rhythms are controlled by a transcriptional feedback system whose activity fluctuates as a function of the light-dark cycle. In mammals, the master clock (circadian pacemaker) resides in the SCN (Suprachiasmatic Nucleus) of the brain's hypothalamus and this endogenous clock drives physiology and behavior. In the absence of external time cues, the SCN master clock generates cycles of approximately but not exactly 24 hours, and its phase must therefore be read...
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