Features of Recent Codon Evolution: A Comparative Polymorphism-Fixation Study

<table>Nonsynonymous to synonymous substitutions (N/S) ratio calculated by the polymorphic and fixed nucleotide changes. Two codons (ATG and TGG) are not included because of their lack of synonymous substitutions. Symbol “#” indicates NCG codons. Codons are placed by the descending order of the polymorphism’s N/S ratios.</table>

BioMed Research International

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Figure 4

Figure 4: Features of Recent Codon Evolution: A Comparative Polymorphism-Fixation Study 