3BWU:
reference: Crystal structure of the ternary FimC-FimF(t)-FimD(N) complex indicates conserved pilus chaperone-subunit complex recognition by the usher FimD., Eidam O, Dworkowski FS, Glockshuber R, Grutter MG, Capitani G, FEBS Lett. 2008 Mar 5;582(5):651-5. Epub 2008 Jan 31. PMID: 18242189

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