Responses to stimuli the internal state and gene expression

In chapter 8 we described the "dialogue" between a cell's internal state and its pattern of gene expression. We drew attention to the delay between a change in the gene expression pattern and the resulting change in internal state. This combination of dialogue and delay allows the cell to change progressively: the cell cycle, differentiation and apoptosis are possible consequences.

Now we can extend this account. The dialogue is three-way, not two-way. In the previous section we outlined the mechanisms by which external

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