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DNA is constantly damaged and repaired in living cells. The repair products of the oxidative DNA lesions, i.e. oxidised nucleosides and bases, are poor substrates for the enzymes involved in nucleotide synthesis, are fairly water soluble, and generally excreted into the urine without further metabolism. Among the possible products, 8-oxo-2'-deoxyguanosine, 8-oxoguanine, thymine glycol, thymidine glycol...
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