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- FIGURE 6-1. Schematic representation of cell cycle phases. Mitogens
- can drive quiescent cells into the cell cycle and antimitogenic
- signals can drive cells into a quiescent phase. Once a cell passes the
- restriction point (R), it is committed to progress through S phase,
- even in the absence of mitogenic signals. The DNA is replicated in S
- phase, and the chromosomes are segregated in mitosis. Cell cycle
- checkpoints (denoted by asterisks and discussed later) in G1, S, G2,
- and mitosis have been identified.
-