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upp | Uracil phosphoribosyltransferase; Catalyzes the conversion of uracil and 5-phospho-alpha-D- ribose 1-diphosphate (PRPP) to UMP and diphosphate. (208 aa) | ||||
pyrR | Bifunctional protein PyrR; Also displays a weak uracil phosphoribosyltransferase activity which is not physiologically significant. (181 aa) |