Histograms of the frequencies of numbers of differences between pairs of genomes in SNPs, genomic islands, accessory genes, or PFGE bands.

<p>Histograms of the frequencies of numbers of differences between pairs of genomes in SNPs (A), genomic islands (B), accessory genes (C), or PFGE bands (D). The X axes of histograms A and C indicate the maximal number of differences within the indicated ranges in order to ensure that the first column only includes identical pairs (maximum = 0). These frequency distributions correspond to the same data which were used for comparisons in <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1003471#pgen-1003471-g008" target="_blank">Figure 8</a>, except that those referred to genetic similarity and the data here refer to the converse, which are differences.