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Simplified model of circadian clock involving KaiAC proteins based on van Zon et al. (17). A KaiC hexamer, with six phosphorylation sites, can also take an active or inactive state. In the active state, KaiC phosphorylation is catalyzed by KaiA at the rate kp, whereas in the inactive state, dephosphorylation progresses without any enzymes at the rate kdp. Affinity between active KaiC and KaiA reduces as the number of phosphorylated sites of KaiC increases.
