1B8N:
reference: Atomic dissection of the hydrogen bond network for transition-state analogue binding to purine nucleoside phosphorylase., Kicska GA, Tyler PC, Evans GB, Furneaux RH, Shi W, Fedorov A, Lewandowicz A, Cahill SM, Almo SC, Schramm VL, Biochemistry 2002 Dec 10;41(49):14489-98. PMID: 12463747

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