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Epigenetics reveals unexpected, and some identical, results

One study finds tissue-specific methylation signatures in the genome; another a similarity between identical twins in DNA’s chemical tagging

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1:16pm, January 18, 2009

Tattoos on the skin can say a lot about a person. On a deeper level, chemical tattoos on a person’s DNA are just as distinctive and individual — and say far more about a person’s life history.

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