Figure 1

Novel regions distribution among the E. coli strains in Table 1. The distribution of 1456 regions ~500 bp in size among 17 E. coli O157:H7 strains and the O145:NM strain EC33264 and K12 strain MG1655. Regions are not necessarily contiguous and are defined as novel based on less than 80% sequence identity to the genome of either EDL933 or Sakai. Black indicates the presence of a region and white indicates the absence of a region.