Figure 5.

Ratios of nonsynonymous/synonymous (dN/dS) nucleotide substitutions between the protein-coding genes of xenopus mitochondrial genomes. Although the ratios differ considerably between genes, complexes and pairs of species, in all cases genes are evolving under negative (purifying) selective pressure (dN/dS < 1).

Lloyd et al. BMC Genomics 2012 13:496   doi:10.1186/1471-2164-13-496
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