Overview of relative and cumulative proportions of shared gene families as the number of included genomes increases. Each pair of bars along the x-axis represents the relative (dark grey) and cumulative (light grey) proportions of gene families that are shared among the indicated number of strains. E.g. the first pair of bars indicates the proportion of gene families that were found in only one of the 16 strains, the second pair indicates the proportion shared by two of the 16 strains, while the final pair indicates the proportion of the pan-genome that is common to all 16 strains. All duplicated gene annotations were removed for this analysis. 11.5% of annotated genes are unique to one strain while 52.4% are common to all. The total number of gene families in the pan-genome is 6152.