1FSG:
reference: Substrate deformation in a hypoxanthine-guanine phosphoribosyltransferase ternary complex: the structural basis for catalysis., Heroux A, White EL, Ross LJ, Kuzin AP, Borhani DW, Structure Fold Des 2000 Dec 15;8(12):1309-18. PMID: 11188695

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