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The cell cycle comprises of several phases: G0, G1, S, G2, and M. At all phases, there are checkpoints to regulate cell proliferation. G0 is the resting phase. G1 and G2 are gap phases before mitosis. In G1, amino-acids and enzymes required for DNA replication are mobilized. At the G2 checkpoint, the cellâ??s readiness for mitosis is confirmed.

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