Additional file 4.

Figure S3. a) mtDNA synonymous diversity (πs) in birds (n = 46) and mammals (n = 123). The median, quartiles, and extrema of the distribution of πs are given. b) Residuals of the relationship between mtDNA synonymous diversity (πs) and third-codon position substitution rate in birds and mammals.

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Nabholz et al. BMC Evolutionary Biology 2009 9:54   doi:10.1186/1471-2148-9-54