6CD2:
reference: Structural basis for usher activation and intramolecular subunit transfer in P pilus biogenesis in Escherichia coli., Omattage NS, Deng Z, Pinkner JS, Dodson KW, Almqvist F, Yuan P, Hultgren SJ, Nat Microbiol. 2018 Oct 1. pii: 10.1038/s41564-018-0255-y. doi:, 10.1038/s41564-018-0255-y. PMID: 30275511

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