Figure 1From: A codon substitution model that incorporates the effect of the GC contents, the gene density and the density of CpG islands of human chromosomesScatter plot of CpG and non-CpG substitution rates that are positively correlated to the number of CpG islands per site on the chromosome. Open squares: Synonymous C to T substitution rate at CpG sites on the autosomes. Closed squares: Synonymous C to T substitution rate at CpG Sites on the X chromosome.Back to article page