1B8O:
reference: Transition state structure of purine nucleoside phosphorylase and principles of atomic motion in enzymatic catalysis., Fedorov A, Shi W, Kicska G, Fedorov E, Tyler PC, Furneaux RH, Hanson JC, Gainsford GJ, Larese JZ, Schramm VL, Almo SC, Biochemistry 2001 Jan 30;40(4):853-60. PMID: 11170405

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