1CBL:
reference: The 1.9 A structure of deoxy beta 4 hemoglobin. Analysis of the partitioning of quaternary-associated and ligand-induced changes in tertiary structure., Borgstahl GE, Rogers PH, Arnone A, J Mol Biol 1994 Feb 25;236(3):831-43. PMID: 8114097

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