2R4X:
reference: Ligand Migration and Binding in the Dimeric Hemoglobin of Scapharca inaequivalvis(,)., Nienhaus K, Knapp JE, Palladino P, Royer WE Jr, Nienhaus GU, Biochemistry. 2007 Nov 15;. PMID: 18001141

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