Figure 2

Plots of the relative positions of orthologs in the Helicobacter pylori J99 and H. pylori 26695 genomes. The values on the x and y axes represent the positions of genes on chromosomes, in base pairs. (a) The closest orthologs (best matches) that have not switched their positions between the leading and the lagging DNA strands. (b) All orthologs that have switched positions between the leading and the lagging DNA strands. The genome sequences and orthologs, extracted from the database of Clusters of Orthologous Groups ('COGs') [12], were obtained from the National Center for Biotechnology Information [13].