Phylogenetic distribution of gene clusters. Heatmap: columns correspond to gene clusters present in E. coli and conserved in at least 50% of the other genomes (rows). The value of each cell is the fraction of gene pairs in the gene cluster that are also present in a genome. Genomes are ordered on the basis of the phylogenetic distance with respect to E. coli. Bottom chart: length of the gene clusters.
Brilli et al. BMC Genomics 2013 14:309 doi:10.1186/1471-2164-14-309