2DN3:
reference: 1.25 a resolution crystal structures of human haemoglobin in the oxy, deoxy and carbonmonoxy forms., Park SY, Yokoyama T, Shibayama N, Shiro Y, Tame JR, J Mol Biol. 2006 Jul 14;360(3):690-701. Epub 2006 May 30. PMID: 16765986

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