4DAE:
reference: Insights into phosphate cooperativity and influence of substrate modifications on binding and catalysis of hexameric purine nucleoside phosphorylases., de Giuseppe PO, Martins NH, Meza AN, Dos Santos CR, Pereira HD, Murakami MT, PLoS One. 2012;7(9):e44282. Epub 2012 Sep 5. PMID: 22957058

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