4EDO:
reference: Structural basis for bathochromic shift of fluorescence in far-red fluorescent proteins eqFP650 and eqFP670., Pletnev S, Pletneva NV, Souslova EA, Chudakov DM, Lukyanov S, Wlodawer A, Dauter Z, Pletnev V, Acta Crystallogr D Biol Crystallogr. 2012 Sep;68(Pt 9):1088-97. doi:, 10.1107/S0907444912020598. Epub 2012 Aug 18. PMID: 22948909

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