| 2K2N: reference: Solution Structure of a Cyanobacterial Phytochrome GAF Domain in the Red-Light-Absorbing Ground State., Cornilescu G, Ulijasz AT, Cornilescu CC, Markley JL, Vierstra RD, J Mol Biol. 2008 Aug 22. PMID: 18762196 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).