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Cytosine glycols are intermediate unstable products of cytosine oxidation. These, in turn, are thought to undergo deamination to uracil glycols, dehydration to 5-hydroxycytosine, or both deamination and dehydration to 5-hydroxyuracil.
The lifetime of cytosine glycols are enhanced in double-stranded DNA compared to the free nucleoside.
References
Cytosine glycol Wikipedia(Text) CC BY-SA