1FZ0:
reference: Crystal structures of the soluble methane monooxygenase hydroxylase from Methylococcus capsulatus (Bath) demonstrating geometrical variability at the dinuclear iron active site., Whittington DA, Lippard SJ, J Am Chem Soc 2001 Feb 7;123(5):827-38. PMID: 11456616

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