3ML3:
reference: Crystal Structure of the Autochaperone Region from the Shigella flexneri Autotransporter IcsA., Kuhnel K, Diezmann D, J Bacteriol. 2011 Apr;193(8):2042-5. Epub 2011 Feb 18. PMID: 21335457

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