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Patent Pending Thymidylate kinase (EC 2.7.4.9; dTMP kinase) catalyzes the phosphorylation of thymidine 5'-monophosphate (dTMP) to form thymidine 5'-diphosphate (dTDP) in the presence of ATP and magnesium: ATP + thymidine 5'-phosphate \rightleftharpoons ADP + thymidine 5'-diphosphate Thymidylate kinase is a ubiquitous enzyme of about 25 Kd and is important in the dTTP synthesis pathway for DNA synthesis.