| 4FOF: reference: A Photo-Labile Thioether Linkage to Phycoviolobilin Provides the Foundation for the Blue/Green Photocycles in DXCF-Cyanobacteriochromes., Burgie ES, Walker JM, Phillips GN Jr, Vierstra RD, Structure. 2013 Jan 8;21(1):88-97. doi: 10.1016/j.str.2012.11.001. Epub 2012 Dec , 6. PMID: 23219880 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).