6V1W:
reference: NMR structure of a vestigial nuclease provides insight into the evolution of functional transitions in viral dsDNA packaging motors., Mahler BP, Bujalowski PJ, Mao H, Dill EA, Jardine PJ, Choi KH, Morais MC, Nucleic Acids Res. 2020 Oct 21. pii: 5934415. doi: 10.1093/nar/gkaa874. PMID: 33089330

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