Figure 5
From: Ultraconserved coding regions outside the homeobox of mammalian Hox genes
Reduced substitution rates in the central region of Hox gene clusters. A. Correlation between the synonymous mutation rates (d S ) of coding regions of Hox genes and their locations in the Hox cluster. The d S values are plotted against the corresponding number of cognate groups. B. Correlation between nucleotide substitution rates of intronic sequences of each Hox genes and their positions on the cluster. C. Correlation between nucleotide substitution rates of intergenic sequences and their positions on the Hox cluster. The numbers on the x axis represent the numbers of cognate group at 5' flanking end of each intergenic sequence.