Accessory genome diversity in ST22. CDSs in the accessory genome of each isolate were clustered and assigned to homology groups (HGs). (A) Conservation of accessory genome HGs across the ST22 population. The isolates are ordered according to the phylogeny displayed along the left and top of the figure. The conserved HGs in the pairwise comparison are displayed as a heat map matrix and colored according to the number of conserved HGs (range 64 to 235 HGs) per pair; see figure for scale. (B) Size and composition of each isolate's accessory genome based on the number of HG CDSs. The HGs have been subdivided into different mobile genetic element types based on matches to an annotated MGE reference set included in the clustering (see legend to figure).
