6QK2:
reference: Key Structural Motifs Balance Metal Binding and Oxidative Reactivity in a Heterobimetallic Mn/Fe Protein., Kisgeropoulos EC, Griese JJ, Smith ZR, Branca RMM, Schneider CR, Hogbom M, Shafaat HS, J Am Chem Soc. 2020 Mar 18;142(11):5338-5354. doi: 10.1021/jacs.0c00333. Epub, 2020 Mar 9. PMID: 32062969

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