6NJO:
reference: Cryo-EM structure of the homohexameric T3SS ATPase-central stalk complex reveals rotary ATPase-like asymmetry., Majewski DD, Worrall LJ, Hong C, Atkinson CE, Vuckovic M, Watanabe N, Yu Z, Strynadka NCJ, Nat Commun. 2019 Feb 7;10(1):626. doi: 10.1038/s41467-019-08477-7. PMID: 30733444

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