Fig. 2From: Selection on different genes with equivalent functions: the convergence story told by Hox genes along the evolution of aquatic mammalian lineagesThe 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 ratesBack to article page