FIG. 3.

Genetic map of the uropathogenic E. coli strain 536-specific chuA gene (A) and that of EHEC strain EDL933 (B). The chuA coding regions are indicated by boxes; the 5′ flanking regions are indicated by single lines. The arrows labeled with P denote the promoters. The sequences of the upstream element specific for strain 536 or strain EDL933 are given. Bases in boldface type represent the direct repeats flanking dissimilar regions. The numbers and thick lines denote the probes used for Southern hybridization (see text). The sequences of oligonucleotides used as probes are underlined.