Figure 6
Nested model test on differential selective pressures between the B. subtilis -group and the B. cereus -group in conserved genes. (A) Specification of ω along branches. (B) Summary of nested model test results in Venn diagrams. The numbers of coat proteins are indicated by closed circles in gray, and the numbers of essential genes by dashed circles in white. There are a total of 1174 genes (including 19 coat protein and 182 essential genes) in this LRT study. Alternative models of H1c, H1s, and H2 were accepted with q-values less than 0.05. (C) Comparison of branch ω in the B. subtilis clade (ωs) and the B. cereus clade (ωc). The dash diagonal line indicates ωs = ωc. Red circles represent coat protein genes, open triangles essential genes, and gray crosses are nonCE genes. Estimations of branch ω were based on model H2. For coat proteins, ωs > ωc was found with a p-value of 0.072 based on paired Wilcoxon test.