| 6FQF: reference: Crystal structure of the ferric homotetrameric beta4 human hemoglobin., Mazzarella L, Merlino A, Balasco N, Balsamo A, Vergara A, Biophys Chem. 2018 May 23;240:9-14. doi: 10.1016/j.bpc.2018.05.003. PMID: 29857171 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).