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Maximum clade credibility tree showing divergence date estimates based on a combined analysis of the mitochondrial cytochrome-b gene (Cytb) and 3 nuclear genes (alcohol dehydrogenase—Adh1-I2, beta fibrogen—Fgb-I7, and interphotoreceptor retinoid-binding protein—Rbp3). Divergence date estimates are indicated along the x-axis in millions of years. Error bars represent the 95% highest posterior density for node height. Peromyscus (sensu lato) affiliated genera are indicated in bold.
