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π n/πs ratio against GC3 for each species (A: primates, B: Galloanserae) and each type of mutations (W → S, S → W, and GC-conservative mutations) and average nonsynonymous (C) and synonymous (D) allele frequency for each species for W → S, S → W, and GC-conservative SNPs (statistics estimated without masking CpG sites).
