Figure 4. Effect of positive autoregulation on convergence fractions.

Positive autoregulatory loops were added randomly to 10% of the nodes in four ensembles, each comprising 500 networks of a given size (N=1,000 or 3,000) and topology (SF-Binom or vice versa). Convergence in each ensemble is compared to controls without extra loops, with and without matching of the degree distributions to the enriched ensemble (Null 1 and Null2, respectively). Parameters of the SF and Binom distributions (prior to addition of loops) are: SF, (a=1, γ=2.4) and Binomial, (p= and N). Other parameters are g₀=10, α=100, ɛ=3, c=0.2, D=10⁻³ and y=0.