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Fig. 1. Cell cycles discussed at the meeting. Cell cycle phases can be modified to
meet the demands of a cell at specific developmental stages. The first three
cycles shown increase cell number by incorporating mitosis (M), but their
coupling to external influences, such as growth, vary. In the fourth cycle
shown, M is repressed, and the primary result of this is polyploidy, which is
associated with growth and differentiation in many plant cell types and in
some animal cell types.
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