3U7H:
reference: Structural basis for the phosphatase activity of polynucleotide kinase/phosphatase on single- and double-stranded DNA substrates., Coquelle N, Havali-Shahriari Z, Bernstein N, Green R, Glover JN, Proc Natl Acad Sci U S A. 2011 Dec 27;108(52):21022-7. Epub 2011 Dec 14. PMID: 22171004

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