Proteins That Are Involved In The Regulation Of The Cell Cycle, And That Show Fluctuations In Concentration During The Cell Cycle, Are Called?


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Cyclin: The kinases that drive the cell cycle are actually present at a constant concentration in the growing cell, but much of the time they are in an inactive form. To be active, such a kinase must be attached to a cyclin, a protein that gets its name from its cyclically fluctuating concentration in the cell. Because of the requirement, these kinases are called cyclin-dependent kinases, or Cdks. The activity of a Cdk rises and falls with changes in the concentration of its  cyclin partner. (Campbell & Reece AP Biology, Seventh Edition)

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