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. 2021 May 14;33(8):2602–2617. doi: 10.1093/plcell/koab133

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© The Author(s) 2021. Published by Oxford University Press on behalf of American Society of Plant Biologists.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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A proposed working model for the dynamic formation of BBX19–PRRs complex over a 24 h in regulating the CCA1 and RVE8 expression. Zinc finger transcription factor, BBX19 protein, is expressed during the daytime. Sequentially expressed PRR9, PRR7, and PRR5 interact with BBX19 in precise temporal ordering from dawn to dusk. PRR proteins affect BBX19 recruitment to the CCA1 and RVE8 promoters. BBX19–PRRs complexes function directly in transcriptional regulation of the circadian clock to orchestrate circadian rhythms