5JDO:
reference: Evolutionary diversification of the trypanosome haptoglobin-haemoglobin receptor from an ancestral haemoglobin receptor., Lane-Serff H, MacGregor P, Peacock L, Macleod OJ, Kay C, Gibson W, Higgins MK, Carrington M, Elife. 2016 Apr 15;5. pii: e13044. doi: 10.7554/eLife.13044. PMID: 27083048

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