Additional file 8.

Figure S8 Effect of environmental stability on robustness. (a) Mutational and (b) environmental robustness (Rm and Re) of gene ffs for different bacteria (Buchnera aphidicola, Mycoplasma genitalium, Vibrio fischeri, Escherichia coli, Salmonella enterica, Citrobacter koseri, Serratia proteamaculans, and Pseudomonas putida). * denotes statistical significance in a one-tailed z-test with (a) P-value = 0.059 and (b) P-value = 0.041. When including into the analysis 15 more strains of E. coli with different ffs sequences, we obtained (a) P-value = 0.005 and (b) P-value = 0.017.

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Rodrigo and Fares BMC Evolutionary Biology 2012 12:52   doi:10.1186/1471-2148-12-52