The expression of cyclin must be regulated because if they were constantly expressed, then cells would be rapidly dividing rather than performing their normal activities. Cyclins control progression through the cell cycle.
Cyclins control and cyclin-dependent kinases are two fundamental types of proteins that work together to control the progression through the cell cycle.
These proteins control cell division by modulating transcriptional cascades in response to different extracellular and intracellular cues.
Cyclin-dependent kinases are kinase proteins that phosphorylate cyclins in specific points of control of the cell cycle, thereby regulating the passage through different stages.
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