Additional file 4.

Orthology of RH2 and SWS2 opsin paralogs from five teleost fish genomes. A) RH2 phylogeny. B) SWS2 phylogeny. In both cases, broken lines indicate branches leading from the outgroup that were shortened to fit each tree into the figure; these do not represent missing or incomplete branch length information.

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O'Quin et al. BMC Evolutionary Biology 2011 11:120   doi:10.1186/1471-2148-11-120