1DKH:
reference: Functional aspects of the heme bound hemophore HasA by structural analysis of various crystal forms., Arnoux P, Haser R, Izadi-Pruneyre N, Lecroisey A, Czjzek M, Proteins 2000 Nov 1;41(2):202-10. PMID: 10966573

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