The relationship between the noise amplitude and the growth rate obtained by the alternative model without the growth-dependence on EFR.

<p>The geometric mean of the growth rates attained by randomly generated regulatory networks is plotted as a function of the noise amplitude . The growth rates for different values of are superimposed by using different colors. In the intermediate range of the noise amplitude , the average growth rates obtained in the cases with are significantly higher than the case without EFR (), due to the selection of actively growing state by noise.