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. 2006 Feb;188(3):909–918. doi: 10.1128/JB.188.3.909-918.2006

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Copyright © 2006, American Society for Microbiology

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FIG. 8. — Genes for pyrimidine salvage pathways for synthesis of dTTP and dCTP and their inferred presence in (+) or absence from (−) Borrelia burgdorferi and B. hermsii. The genes are uridine kinase (udk; EC 2.7.1.48), cytidylate kinase (cmk; EC 2.7.4.14), ribonucleoside diphosphate reductase (nrdEF; EC 1.17.4.1), thymidylate kinase (tmk; EC 2.7.4.9), thymidine kinase (tdk; EC 2.7.1.21), nucleoside diphosphate kinase (ndk; EC 2.7.4.6), and thymidylate synthase (thyX; EC 2.1.1.148). The lack of function of the B. burgdorferi thyX gene product in complementation and in vitro assays is indicated by quotation marks.