4CAB:
reference: Structure of the mono-functional heme catalase DR1998 from Deinococcus radiodurans., Borges PT, Frazao C, Miranda CS, Carrondo MA, Romao CV, FEBS J. 2014 Jun 26. doi: 10.1111/febs.12895. PMID: 24975828

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