| 1GKS: reference: Ectothiorhodospira halophila ferrocytochrome c551: solution structure and comparison with bacterial cytochromes c., Bersch B, Blackledge MJ, Meyer TE, Marion D, J Mol Biol 1996 Dec 6;264(3):567-84. PMID: 8969306 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).