2YPW:
reference: Structure of a bacterial type IV secretion core complex at subnanometre resolution., Rivera-Calzada A, Fronzes R, Savva CG, Chandran V, Lian PW, Laeremans T, Pardon E, Steyaert J, Remaut H, Waksman G, Orlova EV, EMBO J. 2013 Mar 19. doi: 10.1038/emboj.2013.58. PMID: 23511972

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