2RG7:
reference: Holo- and apo-bound structures of bacterial periplasmic heme-binding proteins., Ho WW, Li H, Eakanunkul S, Tong Y, Wilks A, Guo M, Poulos TL, J Biol Chem. 2007 Dec 7;282(49):35796-802. Epub 2007 Oct 9. PMID: 17925389

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