2VHQ:
reference: Structural Basis of Mechanochemical Coupling in a Hexameric Molecular Motor., Kainov DE, Mancini EJ, Telenius J, Lisal J, Grimes JM, Bamford DH, Stuart DI, Tuma R, J Biol Chem. 2008 Feb 8;283(6):3607-3617. Epub 2007 Dec 5. PMID: 18057007

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