Unrooted tree with the pre-specified foreground branches used in the ML branch-site analysis. The OS-X sequences were not considered in this analysis (see Methods). b1 and b2 correspond to the D. melanogaster and D. guanche OS-E external lineages, respectively. Λ, Putative OS-E and OS-F ancestral protein node.
Sánchez-Gracia and Rozas BMC Evolutionary Biology 2008 8:323 doi:10.1186/1471-2148-8-323