The 5-methylcytosine reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

5-methylcytosine

5-methylcytosine is the methylated form of cytosine. The methyl group is attached to carbon 5, and alters its properties.

5-methylcytosine is formed by the action of DNA methyltransferase on CpG sites. It can undergo spontaneous deamination to form thymine.

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