1MWB:
reference: The solution structure of the recombinant hemoglobin from the cyanobacterium Synechocystis sp. PCC 6803 in its hemichrome state., Falzone CJ, Christie Vu B, Scott NL, Lecomte JT, J Mol Biol 2002 Dec 13;324(5):1015-29. PMID: 12470956

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