3LHS:
reference: The Staphylococcus aureus siderophore receptor HtsA undergoes localized conformational changes to enclose staphyloferrin A in an arginine-rich binding pocket., Grigg JC, Cooper JD, Cheung J, Heinrichs DE, Murphy ME, J Biol Chem. 2010 Apr 9;285(15):11162-71. Epub 2010 Feb 10. PMID: 20147287

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