Cumulative distribution function plots for CpG island length, CpG island count and CpG island length to gene length ratio. In all of the plots, the values for target genes are significantly larger than other analyzed sets of genes (bystander genes, other CpG-covered genes and other TFs). (a) CpG scores for target genes and bystander genes. (b) CpG scores for target genes and other CpG island genes. (c) CpG scores for target genes and other TFs.