'The Growth 1 (G1) phase is the first checkpoint in the cell cycle that may cause a cell to exit the cycle if this point is not passed.
The checkpoints in the cell cycle are stages during the cell cycle that need to fulfill certain requirements in order that the cell cycle can proceed. These sequential checkpoints in the cell cycle are found first at the G1 phase, then the S phase and finally the mitotic M phase.
Therefore, with this data, we can see that the checkpoints in the cell cycle control everything is fine in order to proceed with the cell cycle.
Learn more about the checkpoints in the cell cycle here:
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