reports DNA prevention isolate

Controversial DNA modification could play key role in placenta development

www.sciencemag.org

Elizabeth PennisiThe genetic code in mammals may have gained another letter—or at least a significant footnote. Textbooks speak of four DNA building blocks, whose order specifies genes.

But researchers in the field of epigenetics have also identified four chemically modified versions of these nucleoside bases, which affect how genes are expressed.

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