1V2H:
reference: Crystal structure of human PNP complexed with guanine., de Azevedo WF Jr, Canduri F, dos Santos DM, Pereira JH, Bertacine Dias MV, Silva RG, Mendes MA, Basso LA, Palma MS, Santos DS, Biochem Biophys Res Commun 2003 Dec 19;312(3):767-72. PMID: 14680831

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