6DKQ:
reference: The Streptococcus pyogenes Shr protein captures human hemoglobin using two structurally unique binding domains., Macdonald R, Cascio D, Collazo MJ, Phillips M, Clubb RT, J Biol Chem. 2018 Nov 23;293(47):18365-18377. doi: 10.1074/jbc.RA118.005261. Epub, 2018 Oct 9. PMID: 30301765

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