2RET:
reference: The crystal structure of a binary complex of two pseudopilins: EpsI and EpsJ from the type 2 secretion system of Vibrio vulnificus., Yanez ME, Korotkov KV, Abendroth J, Hol WG, J Mol Biol. 2008 Jan 11;375(2):471-86. Epub 2007 Oct 22. PMID: 18022192

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