Fig. 4

Distribution of shared genes in core and accessory genomes. Number of shared genes versus frequency of observation across the a core genomes and b accessory genomes of 12 species. c Functional breakdown of the 168 genes observed in all 12 core genomes. Colors correspond to individual COG functional categories, which are labeled by the number of shared core genes annotated with the COG and COG definition. For metabolic COGs, individual genes and associated pathways are listed