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. 2016 May 21;16:113. doi: 10.1186/s12862-016-0682-4

Fig. 2.

Fig. 2

The ω values for Hox genes in cetaceans, pinnipeds, sirenian and average value for the remaining mammals (solid line) derived from the two-ratio model. Asterisks indicate those Hox genes statistically inferred as evolving under positive selection or those having significantly higher evolutionary rates