Figure 9. Transcription factor network for E. coli. A) Power-law plot of information reported in reference 37 for genes and opérons (several, coregulated genes). The fit was done the same as in Figure 8. B) Power law fits for the core TF network, the "in" (red) and "out" (blue) networks. Combining the "in" and "out" networks to get a more statistically meaningful exponent gives a value of 1.8 (yellow). C) Conceptual diagram showing how the "core" network and the "effector" network are related. A color version of this figure is available online at


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