3TTU:
reference: Mutation of Phe413 to Tyr in catalase KatE from Escherichia coli leads to side chain damage and main chain cleavage., Jha V, Donald LJ, Loewen PC, Arch Biochem Biophys. 2012 Sep 15;525(2):207-14. doi: 10.1016/j.abb.2011.11.022. , Epub 2011 Dec 8. PMID: 22172685

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