4E40:
reference: Structure of the trypanosome haptoglobin-hemoglobin receptor and implications for nutrient uptake and innate immunity., Higgins MK, Tkachenko O, Brown A, Reed J, Raper J, Carrington M, Proc Natl Acad Sci U S A. 2013 Jan 29;110(5):1905-10. doi:, 10.1073/pnas.1214943110. Epub 2013 Jan 14. PMID: 23319650

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