2OKD:
reference: Structures of vaccinia virus dUTPase and its nucleotide complexes., Samal A, Schormann N, Cook WJ, Delucas LJ, Chattopadhyay D, Acta Crystallogr D Biol Crystallogr. 2007 May;63(Pt 5):571-80. Epub 2007, Apr 21. PMID: 17452782

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