1V48:
reference: Calf spleen purine-nucleoside phosphorylase: crystal structure of the binary complex with a potent multisubstrate analogue inhibitor., Luic M, Koellner G, Yokomatsu T, Shibuya S, Bzowska A, Acta Crystallogr D Biol Crystallogr. 2004 Aug;60(Pt 8):1417-24. Epub 2004, Jul 21. PMID: 15272165

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