Predicting a novel pathogenicity island in Helicobacter pylori by genomic barcoding

Figure 1 2-D barcode images of genomes of Helicobacter pylori strains J99, G27, 26695, HPAG1, P12, and Shi470, Escherichia coli O157:H7 strain EDL933, and a random sequence. The y-axis represents the genome axis from top-down, with each pixel representing a fragment of n = 1000 bp; the x-axis represents the 4-nucletide frequencies. The abnormal barcode regions are demarcated by a rectangle.