2LNV:
reference: Solution Structure of Homology Region (HR) Domain of Type II Secretion System., Gu S, Kelly G, Wang X, Frenkiel T, Shevchik VE, Pickersgill RW, J Biol Chem. 2012 Mar 16;287(12):9072-80. Epub 2012 Jan 17. PMID: 22253442

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