Figure 1

Ratios of complementary transition frequencies across vertebrates. There are four rows of panels and two columns of panels. The rows correspond to the four taxa analyzed in this study and the columns to the two types of ratios between complementary transition frequencies. Each panel consists of two sections: The left section is centered on the TSSs (left 0 k) and refers to 5 kbp of intergenic region upstream to the TSS and extends towards 5 kbp of intronic region downstream to the TSS. The right section on a panel is similarly centered on the 3'ends (right 0 k), while the analyzed regions extend from 5 kbp of intronic regions (upstream to the 3'end) to 5 kbp of intergenic regions downstream to the genes 3' ends. The ratios are plotted against the distance from the 5' and 3'ends of genes. Ratios are calculated along the non-template strand from pooled 200 bp windows of genes annotated for the reference species in each taxon. For CGI-genes the ratios are presented by thick lines, for nonCGI-genes ratios as thin lines.