5ZDH:
reference: Structural insight into the assembly of the type II secretion system pilotin-secretin complex from enterotoxigenic Escherichia coli., Yin M, Yan Z, Li X, Nat Microbiol. 2018 May;3(5):581-587. doi: 10.1038/s41564-018-0148-0. Epub 2018, Apr 9. PMID: 29632366

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