Locally collinear blocks identified among the nine enterobacterial genomes listed in Table 1. Each contiguously colored region is a locally collinear block, a region without rearrangement of homologous backbone sequence. LCBs below a genome's center line are in the reverse complement orientation relative to the reference genome. Lines between genomes trace each orthologous LCB through every genome. Large gray regions within an LCB signify the presence of lineage-specific sequence at that site. Each of the 45 blocks has a minimum weight of 69. The Shigella and Salmonella genomes have undergone more genome rearrangements than the E. coli, possibly because of the presence of specific mobile genetic elements. The computation consumed ∼3 h on a 2.4-GHz workstation with 1 GB of memory. The figure was generated by the Mauve rearrangement viewer.
