2DPY:
reference: Structural similarity between the flagellar type III ATPase FliI and F1-ATPase subunits., Imada K, Minamino T, Tahara A, Namba K, Proc Natl Acad Sci U S A. 2007 Jan 9;104(2):485-90. Epub 2007 Jan 3. PMID: 17202259

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