1I0L:
reference: The role for an invariant aspartic acid in hypoxanthine phosphoribosyltransferases is examined using saturation mutagenesis, functional analysis, and X-ray crystallography., Canyuk B, Focia PJ, Eakin AE, Biochemistry 2001 Mar 6;40(9):2754-65. PMID: 11258886

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