2ZFO:
reference: Structure of the partially unliganded met state of 400 kDa hemoglobin: Insights into ligand-induced structural changes of giant hemoglobins., Numoto N, Nakagawa T, Kita A, Sasayama Y, Fukumori Y, Miki K, Proteins. 2008 Apr 8;. PMID: 18398907

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