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An autofeedback loop associated with transcription of clock gene(s), Per(s), is generally accepted as the molecular machinery of circadian rhythm generation, in which CLOCK/BMAL act as positive regulators and PER/CRY as negative ones. We show here an autofeedback loop of Dec1 encoding a basic helix-loop-helix transcription factor: CLOCK/BMAL increased the promoter activity of Dec1, and DEC1 and DEC2...
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