SWS1 visual pigment evolution, with ancestrally reconstructed substitutions at sites 86, 90 & 93 mapped on a phylogeny of Landbirds [31-33,40,56,80-87]. Experimentally reconstructed ancestral nodes are shown along with measured λmax values. GenBank accession numbers provided in Additional file 1: Table S2.
van Hazel et al. BMC Evolutionary Biology 2013 13:250 doi:10.1186/1471-2148-13-250