Tree topology used for the analysis of the natural selection in which the five laurasiatherian species included in all the orthologous groups are depicted.

<p>This tree is based on published literature <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0065491#pone.0065491-Nery1" target="_blank">[57]</a>–<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0065491#pone.0065491-Hallstrom1" target="_blank">[59]</a>.</p

Enrichment analysis of positively selected genes in the dolphin and cow lineages.

<p>Enrichment analysis of positively selected genes in the dolphin and cow lineages.</p

GO distribution within the functional categories overrepresented in the dolphin lineage.

<p>GO distribution within the functional categories overrepresented in the dolphin lineage.</p

Distribution of the number of species included in each orthologous group.

<p>Distribution of the number of species included in each orthologous group.</p