| 3GQG: reference: Correlation between hemichrome stability and the root effect in tetrameric hemoglobins., Vergara A, Franzese M, Merlino A, Bonomi G, Verde C, Giordano D, di Prisco G, Lee HC, Peisach J, Mazzarella L, Biophys J. 2009 Aug 5;97(3):866-74. PMID: 19651045 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).