Figure 6

Influence of gene copy number on gene expressions at steady state. (A) Probability distribution of [Ap] at the end of stochastic simulations for the community size n = 100 (t = 10000 min). Plots for different combinations of gene copy numbers are shown as indicated. (B) [Ap] at steady state ([Ap]*) is plotted as a function of community size for different gene copy numbers as indicated. [Ap]* is calculated according to Eqs.35 in additional file 1 with parameter values in Table 1, ε = 5.78 × 10 ^-7. Dotted lines are the theoretical maxima . (C) [Bp _out ] at steady state ([Bp _out ]*) is plotted as a function of community size for different gene copy numbers. Parameter values are the same as in (B). [Bp _out ]* also approaches to the theoretical upper limit (not shown; ≈ 358000 for a = 2, b = 2; 308000 for a = 1, b = 2; 172000 for a = 2, b = 1; 143000 for a = 1, b = 1).