2K78:
reference: The IsdC protein from staphylococcus aureus uses a flexible binding pocket to capture heme., Villareal VA, Pilpa RM, Robson SA, Fadeev EA, Clubb RT, J Biol Chem. 2008 Sep 3. PMID: 18715872

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