FIG. 1.

Box shade (http://www.ch.embnet.org/software/box_form.html) of predicted amino acid sequences of the 58-kDa subunit of ch2 VacA with the sequences of strain 11638 (m1) and 95-54 (m2) (GenBank accession no. AF191639, S72494, and U95971, respectively). Identical amino acid residues are shaded. The breakpoint between the m1-like and m2-like regions of ch2 is shown between amino acids 648 and 657. The bar above the sequence shows the region essential for the m1 phenotype. The white regions in the bar are above amino acids which are consistently different between the m1 and m2 forms.