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The site frequency spectra (SFS) for different mutation categories at 4-fold degenerated sites. S-to-S (dark gray); S-to-W (blue); W-to-S (red); and W-to-W (light gray). (A) SFS based on derived allele counts from 19,227 polymorphic sites. (B) Proportion of each mutation category for a given derived allele frequency. For 0-fold degenerated sites, see Supplementary fig. S1, Supplementary Material online).
