Overlap between the core OG sets of Bacillaceae and Enterobacteriaceae . (A) A Venn diagram showing the number of core OGs defined in Bacillaceae and Enterobacteriaceae that overlap each other. For each family, the outer circle indicates the entire gene set, and the inner circle indicates the core gene set. The red numbers indicate the number of essential genes in B. subtilis and E. coli. (B) Functional breakdown of each subtype defined in (A): CC core to core; CO, core to non-core ortholog; CN, core to none. The legend shows the abbreviated names of the KEGG functional categories. For the full category names, see Figure 4.