6FDR:
reference: Oxidized and reduced Azotobacter vinelandii ferredoxin I at 1.4 A resolution: conformational change of surface residues without significant change in the [3Fe-4S]+/0 cluster., Schipke CG, Goodin DB, McRee DE, Stout CD, Biochemistry 1999 Jun 29;38(26):8228-39. PMID: 10387068

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