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Molecular components of the circadian clock. CLOCK, circadian locomotor output cycles kaput; BMAL1, brain and muscle ARNT-like-1; PER, period; CRY, cryptochrome; TIM, timeless; SIRT1, sirtuin1; RORs, retinoic acid receptor-related orphan receptors; RRE, REV-ERB/ROR response element.
