Distribution of cytochrome b neutral substitution rate in 1,696 mammalian species (Data from ) and 1,571 birds species (this study). Substitution rates are in unit of substitution per third codon position per million years. Values above 0.4 substitution/site/Myrs years are not shown.
Nabholz et al. BMC Evolutionary Biology 2009 9:54 doi:10.1186/1471-2148-9-54