Distribution of lengths of gene conversion events. We used GENECONV to predict gene conversion events in each pair of sequences of the multiple alignment. (a) Gene conversion events were predicted only for Neisseria meningitidis sequence pairs (six total), in which we identified 1,469 gene conversion fragments with an average length of 1,728 nucleotides. (b) We identified 2,717 putative gene conversion fragments in all pairs of sequences (15 total) with an average length of 1,127 nucleotides (nt; indicated by the vertical dashed line). In both figures, the height of each bar in the figure indicates the number of gene conversion fragments with the specified length.