Figure 6.

Model for the evolution of POU5F1 and POU2 in vertebrates.POU2 and POU5F1 arose by duplication of an ancestral gene in a common ancestor of Osteichthyes and Chondrichthyes. One or other gene then became extinct (indicated by dashed lines) in some lineages. The dogfish and little skate are representatives of Elasmobranchii.

Frankenberg and Renfree BMC Biology 2013 11:56   doi:10.1186/1741-7007-11-56
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