Cell Cycle
At the center of the cell cycle control system is Cdk, a protein that

binds to different cyclins
is phosphorylated to become active
manufactures growth factors
is only active during mitosis

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Cell Cycle
The cell cycle is controlled in most cells by

cell size (when the cell reaches a certain size, it divides)
time (after a certain length of time the cell divides)
a series of checkpoints
different cells exhibit different control strategies

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