Table 1

*Number of E. coli* K12 genes absent from the studied pathogenic E. coli and Shigella strains**
Strain	No. of E. coli K12 genes absent from strain

E. coli O157:H7	132
E. coli O157:H7 EDL933	135
E. coli APEC 01	148
E. coli UTI89	138
E. coli CFT073	174
E. coli 536	180
Shigella sonnei Ss046	255
Shigella flexneri 2a	371
Shigella flexneri 2a 2457T	353
Shigella flexneri 5 8401	347
Shigella boydii Sb227	366
Shigella dysenteriae Sd197	543

Hershberg et al. Genome Biology 2007 8:R164 doi:10.1186/gb-2007-8-8-r164