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Poisson counting processes of genetic variations in the evolutionary process, for (A) N(t) = N1(t) + N2(t). (B) N1(t), denoting the counting process of genetic variations selected for constructing negative feedback loops u* =−Px̃ by natural selection. (C) N2(t), denoting the neutral genetic variations harbored by the robust network, without direct effect on the network phenotype.
