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Patent Pending In enzymology, an uridine phosphorylase (EC 2.4.2.3) is an enzyme that catalyzes the chemical reaction uridine + phosphate \rightleftharpoons uracil + alpha-D-ribose 1-phosphate Thus, the two substrates of this enzyme are uridine and phosphate, whereas its two products are uracil and alpha-D-ribose 1-phosphate.