3HCI:
reference: Methionine Sulfoxide Reductase B Displays a High Level of Flexibility., Ranaivoson FM, Neiers F, Kauffmann B, Boschi-Muller S, Branlant G, Favier F, J Mol Biol. 2009 Sep 4. PMID: 19733575

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