1A3N: Deoxy Human Hemoglobin
reference: The structures of deoxy human haemoglobin and the mutant Hb Tyralpha42His at 120 K., Tame JR, Vallone B, Acta Crystallogr D Biol Crystallogr. 2000 Jul;56(Pt 7):805-11. PMID: 10930827

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