Novel pathogenicity islands of E. tarda FPC503. The syntenies of the T3SS and T6SS genes were compared with the corresponding genes in Escherichia coli O127 and P. ananatis, respectively. Orthologous genes are in the same color and are linked by lines. (A) The T3SS locus (Et-LEE). The positions of five major operons (LEE1, LEE2, LEE3, LEE4, and TIR) are shown below the panel. (B) The T6SS locus (Et-T6SS2).