| 2H9W: reference: Green fluorescent protein ground states: the influence of a second protonation site near the chromophore., Bizzarri R, Nifosi R, Abbruzzetti S, Rocchia W, Guidi S, Arosio D, Garau G, Campanini B, Grandi E, Ricci F, Viappiani C, Beltram F, Biochemistry. 2007 May 8;46(18):5494-504. Epub 2007 Apr 17. PMID: 17439158 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).