2OBL:
reference: Structural analysis of a prototypical ATPase from the type III secretion system., Zarivach R, Vuckovic M, Deng W, Finlay BB, Strynadka NC, Nat Struct Mol Biol. 2007 Feb;14(2):131-7. Epub 2007 Jan 21. PMID: 17237797

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