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Correlation between the normalized chi-square value (from analysis of amino acid substitutions) and the absolute value (Abs) of the difference between the percent frequency (%F) of nucleotide substitutions at the codon position “32” (%F.cp32) and that at the codon position “13” (%F.cp13). Empty circles indicate the 33 overlapping genes under symmetric evolution. Black circles indicate the 32 overlapping genes under asymmetric evolution.
