4TM7:
reference: Enzyme repurposing of a hydrolase as an emergent peroxidase upon metal binding., Fujieda N, Schatti J, Stuttfeld E, Ohkubo K, Maier T, Fukuzumi S, Ward TR, Chem Sci. 2015 Jul 1;6(7):4060-4065. doi: 10.1039/c5sc01065a. Epub 2015 May 7. PMID: 29218172

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