3FUC:
reference: 1.45 A resolution crystal structure of recombinant PNP in complex with a pM multisubstrate analogue inhibitor bearing one feature of the postulated transition state., Chojnowski G, Breer K, Narczyk M, Wielgus-Kutrowska B, Czapinska H, Hashimoto M, Hikishima S, Yokomatsu T, Bochtler M, Girstun A, Staron K, Bzowska A, Biochem Biophys Res Commun. 2010 Jan 1;391(1):703-8. Epub 2009 Nov 26. PMID: 19944078

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