Figure 7
Synonymous and nonsynonymous substitution rates of genes. Each point represents the average synonymous (K S ) and nonsynonymous (K A ) rates between B31 and other strains for a given ORF locus. The average was obtained separately for comparisons of B31 with a strain of the same species (in blue) and with a strain of a different species (in red). Gray lines show one standard deviation of these within- and between-species comparisons. Within each panel, a dash line indicates the neutral expectation (K A =K S ).