4B30:
reference: GFP-like phototransformation mechanisms in the cytotoxic fluorescent protein KillerRed unraveled by structural and spectroscopic investigations., de Rosny E, Carpentier P, J Am Chem Soc. 2012 Oct 31;134(43):18015-21. doi: 10.1021/ja3073337. Epub 2012, Oct 19. PMID: 23025285

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).