4JMQ:
reference: Crystal structure of pb9, the distal tail protein of bacteriophage T5: A conserved structural motif among all siphophages., Flayhan A, Vellieux FM, Lurz R, Maury O, Contreras-Martel C, Girard E, Boulanger P, Breyton C, J Virol. 2013 Oct 23. PMID: 24155371

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