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. 2010 Jul 13;6:389. doi: 10.1038/msb.2010.44

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Copyright © 2010, EMBO and Macmillan Publishers Limited

This is an open-access article distributed under the terms of the Creative Commons Attribution Noncommercial Share Alike 3.0 Unported License, which allows readers to alter, transform, or build upon the article and then distribute the resulting work under the same or similar license to this one. The work must be attributed back to the original author and commercial use is not permitted without specific permission.

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Essential states of the KaiABC system included in our modeling approach. (A) Simplified picture of the major transitions between the four phosphorylation states of the KaiC protein, unphosphorylated (U), serine phosphorylated (S), threonine phosphorylated (T), and both residues phosphorylated (D). Autophosphorylation of KaiC is enhanced by KaiA whose activity is inhibited by only serine phosphorylated KaiBC complexes [S-KaiBC]₆. (B) Rapid assembly and disassembly of KaiC hexamers and KaiBC complexes.