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. 2014 Sep 1;122(9):A251. doi: 10.1289/ehp.122-A251

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graphic file with name ehp.122-A251.g001.jpg — Methylation, or the attachment of a methyl group to DNA at regions where cytosine and guanine are paired (“CpG sites”), has tended to receive the most attention in epigenetic research so far. Less is known about hydroxymethylation, an oxidized derivative of methylation.

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