SEARCH Articles Figures Tables 9-£>-Hypoxanthines Guanin Guanine Hypoxanthin Hypoxanthine Hypoxanthine-guanine Hypoxanthine-guanine phosphoribosyltransferase Phosphoribosyltransferase Purine phosphoribosyltransferases Purine phosphoribosyltransferases phosphoribosyltransferase Purines phosphoribosyltransferase