Additional file 2.

Alternative recontruction of SWS1 opsin evolution, 1. Same tree as in Figure 2, but with clades b and c, which are reconstructed with low support, collapsed, and Cnemophilus placed as sister to the 'core Corvoidea' clade. VS/UVS optimisation represented by yellow for VS, blue for UVS, and barred for ambiguous.

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Ă–deen et al. BMC Evolutionary Biology 2011 11:313   doi:10.1186/1471-2148-11-313