3FO8:
reference: The tail sheath structure of bacteriophage T4: a molecular machine for infecting bacteria., Aksyuk AA, Leiman PG, Kurochkina LP, Shneider MM, Kostyuchenko VA, Mesyanzhinov VV, Rossmann MG, EMBO J. 2009 Feb 19. PMID: 19229296

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