Progress in the eukaryotic cell cycle is driven by oscillations in the activities of CDKs (Cyclin-Dependent Kinases). CDK activity is controlled by periodic synthesis and degradation of positive regulatory subunits, Cyclins, as well as by fluctuations in levels of negative regulators, by CKIs (CDK Inhibitors), and by reversible phosphorylation. The mammalian cell cycle consists of four discrete phases: S-phase, in which DNA is replicated; M-phase, in which the chromosomes are separated over two new nuclei in the process of mi...
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