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What are the four stages of the cell cycle?

The four stages of the cell cycle are gap 1 (G1), synthesis (S), gap 2 (G2), and mitosis (M). The stages G1, S, and G2 make up interphase, which accounts for the span between cell divisions. On the basis of the stimulatory and inhibitory messages a cell receives, it “decides” whether it should enter the cell cycle and divide.