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The cell cycle and cell size. The cell cycle is divided into four phases. G1 is a growth phase immediately following the previous division. S phase is when the DNA is replicated. G2 is a second growth period followed by mitosis or M phase when the DNA is condensed and partitioned into the daughter cells. The relevant phases for cell-size control in different systems discussed in the text are as marked. MBT, midblastula transition.
