Fig. 4From: Regulatory remodeling in the allo-tetraploid frog Xenopus laevis The S subgenome has a higher mutation rate than L. Only genes which none of the L or S copies fall into the pseudogene category are considered. a Ks distribution per subgenome in X. laevis. b Ka/Ks in X. laevis and X. tropicalis Back to article page