Cell cycle. This diagram illustrates the cell cycle of rapidly dividing cells in relation to DNA synthesis. After mitosis, the cell is in interphase. C, represents the period during which a gap occurs in DNA synthesis. S represents the period during which DNA synthesis occurs. During this phase, tritiated thymidine can be incorporated into the DNA to serve as an experimental tracer. G2 represents a second gap in DNA synthesis. G0 represents the path of a cell that has stopped dividing; however, such a cell may reenter the cell cycle at the R point after an appropriate stimulus. The cell residing in G0 may undergo terminal differentiation, GTD. and produce a population of permanent nondividing cells (e.g., adult neurons). The average timing of each phase of the cell cycle is indicated on the diagram.
permanent nondividing cells metaphase mitosis M
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