Figure 6.

UV-visible dark absorption spectra of the (A) ancestral SWS1 pigment of passerines and parrots and (B) ancestral SWS1 pigment of passerines. Absorption maxima (λmax) noted above the dark spectra. Inset, dark-minus-acid bleached difference spectra.

van Hazel et al. BMC Evolutionary Biology 2013 13:250   doi:10.1186/1471-2148-13-250
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