Figure 2.

Chromosomal position and composition of strain-specific genes. The genes were ordered by using a combined J99/26695 map where J99-specific genes are placed at the appropriate sites in the 26695 chromosomal map. The presence (blue) or absence (yellow) of genes was displayed according to their position on the chromosome for each strain (missing data are gray). (Left) The entire H. pylori chromosome starting at position 1. (Right) Zoomed images of the two portions of the plasticity zone, which is continuous in the J99 genome, and the PAI. The names of genes with homology to transposases (orange), topoisomerases or endonucleases (turquoise), type IV secretion homologues (purple), or restriction modification systems (dark green) are indicated.