The clock that governs circadian rhythms is based on a molecular feedback loop, which has just become more complex — two more proteins have been identified as likely components of the loop.
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Alvarez, J., Sehgal, A. Finer clock control. Nature 419, 798–799 (2002). https://doi.org/10.1038/419798a
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DOI: https://doi.org/10.1038/419798a
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