1G9V:
reference: High-resolution crystal structure of deoxy hemoglobin complexed with a potent allosteric effector., Safo MK, Moure CM, Burnett JC, Joshi GS, Abraham DJ, Protein Sci 2001 May;10(5):951-7. PMID: 11316875

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