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Pathways for the synthesis of CTP and the salvage of cytidine in L. lactis. UR, uridine; CR, cytidine; carAB, carbamoylphosphate synthase gene; pyrB, aspartate transcarbamylase gene; pyrC, dihydroorotase gene; pyrD, dihydroorotate dehydrogenase gene; pyrE, orotate phosphoribosyltransferase gene; pyrF, OMP decarboxylase gene; pyrH, UMP kinase gene; pyrG, CTP synthase gene; udk, uridine kinase gene; cdd, cytidine deaminase gene; nup, cytidine/purine nucleoside transporter gene.
