2HIL:
reference: Type IV Pilus Structure by Cryo-Electron Microscopy and Crystallography: Implications for Pilus Assembly and Functions., Craig L, Volkmann N, Arvai AS, Pique ME, Yeager M, Egelman EH, Tainer JA, Mol Cell. 2006 Sep 1;23(5):651-62. PMID: 16949362

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