2YM9:
reference: Crystal structure of PrgI-SipD: insight into a secretion competent state of the type three secretion system needle tip and its interaction with host ligands., Lunelli M, Hurwitz R, Lambers J, Kolbe M, PLoS Pathog. 2011 Aug;7(8):e1002163. Epub 2011 Aug 4. PMID: 21829362

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