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Light is an important cue for resetting the circadian clock. In mammals, light signals are thought to be transmitted to the cAMP response element (CRE) via a binding protein (CRE to induce the expression of Per1 and Per2 genes in the mammalian circadian pacemaker, the suprachiasmatic nuclei (SCN). Several in vitro studies have suggested candidate CRE sites that contribute to the Per1 and Per2 induction by light, resulting in a phase shift of the circadian rhythm. However, it remains unclear whether the CREs are responsible for the light