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<p>and finally divides (M) before restarting the cycle. All these phases in the cell cycle are highly regulated by <a href="page.php?w=cyclins">cyclins</a>, <a href="page.php?w=cyclin-dependent_kinases">cyclin-dependent kinases</a>, and other cell cycle proteins. The phases follow one another in strict order and there are <a href="page.php?w=cell_cycle_checkpoint">cell cycle checkpoint</a>s that give the cell cues to proceed or not, from one phase to another. Cells may also temporarily or permanently leave the cell cycle and enter <a href="page.php?w=G0_phase">G<sub>0</sub> phase</a></p><p>
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