1MZB:
reference: Architecture of a protein central to iron homeostasis: crystal structure and spectroscopic analysis of the ferric uptake regulator., Pohl E, Haller JC, Mijovilovich A, Meyer-Klaucke W, Garman E, Vasil ML, Mol Microbiol 2003 Feb;47(4):903-15. PMID: 12581348

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