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The cell cycle.

The cell cycle.
The cell cycle.

G 0 = resting phase (nonproliferation of cells); G 1 = variable pre-DNA synthetic phase (12 h to a few days); S = DNA synthesis (usually 2 to 4 h); G 2 = post-DNA synthesis (2 to 4 h)—a tetraploid quantity of DNA is found within cells; M 1 = mitosis (1 to 2 h).