2KX4:
reference: Phages have adapted the same protein fold to fulfill multiple functions in virion assembly., Cardarelli L, Pell LG, Neudecker P, Pirani N, Liu A, Baker LA, Rubinstein JL, Maxwell KL, Davidson AR, Proc Natl Acad Sci U S A. 2010 Aug 10;107(32):14384-9. Epub 2010 Jul 26. PMID: 20660769

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