2A0W: Structure Of Human Purine Nucleoside Phosphorylase H257g Mut
reference: Neighboring group participation in the transition state of human purine nucleoside phosphorylase., Murkin AS, Birck MR, Rinaldo-Matthis A, Shi W, Taylor EA, Almo SC, Schramm VL, Biochemistry. 2007 May 1;46(17):5038-49. Epub 2007 Apr 4. PMID: 17407325

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