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What are cyclins and why are they important? Cyclins are a protein in a cell Cyclins regulate the timing of the cell cycle in eukaryotic cells. Explain two different types of cyclins. What jobs do they do in the cell? Internal regulators: Allow the cell cycle to proceed only when certain processes have been carried out. External Regulators: Direct cells to speed up or slow down the cell cycle depending on events outside the cell Feb 1412:29 PM Feb 1412:29 PM What happens when cell growth is unregulated? Cells divide uncontrollably Form tumors that can damage the surrounding tissues Feb 1412:29 PM Feb 1412:29 PM Stem Cells Every cell in your body was produced by mitosis from a small number of stem cells. Unspecialized Cells They have the potential to differentiate Feb 1412:28 PM Dec 1110:25 AM