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Pyrimidine deoxyribonucleotides can be synthesize in two ways: de novo biosynthesis and salvaging pathways. In salvaging pathways nucleosides and bases from RNA and DNA breakdown can reenter de novo pyrimidine deoxyribonucleotide biosynthesis.
Website=www.biocyc.org/Ecoli/Pathways/
free text=Voet and Voet  (textbook)  Biochemistry
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