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. 2019 Apr 30;10:1993. doi: 10.1038/s41467-019-10000-x

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© The Author(s) 2019

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Fig. 1 — Non-polar amino acid residues around the retinylidene β-ionone ring in KR2. The residues mutated to the identical ones as occurring in Chrimson and nine further screened residues are coloured in orange and green, respectively. The Cα atoms are shown as spheres for Gly residues. Ser254 near the retinylidene moiety (in yellow) is coloured in cyan