Additional file 3.
Alternative recontruction of SWS1 opsin evolution, 2. Same tree as in Figure 2, but with all 'basal' nodes with posterior probability < 0.95 collapsed. VS/UVS optimisation represented by yellow for VS, blue for UVS, and barred for ambiguous.
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Ödeen et al. BMC Evolutionary Biology 2011 11:313 doi:10.1186/1471-2148-11-313