5GLS:
reference: Structure of bovine lactoperoxidase with a partially linked heme moiety at 1.98A resolution., Singh PK, Sirohi HV, Iqbal N, Tiwari P, Kaur P, Sharma S, Singh TP, Biochim Biophys Acta. 2016 Dec 13;1865(3):329-335. doi:, 10.1016/j.bbapap.2016.12.006. PMID: 27986533

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