Redefining DNA: Darwin from the Atom Up

In a dramatic rewrite of the recipe for life, scientists from Florida describe the design of a new type of DNA with 12 chemical letters instead of the usual four. This artificial genetic system already is helping to usher in the era of personalized medicine for millions of patients with HIV, hepatitis and other diseases, they say. Their study is scheduled for presentation in March at the 237th National Meeting of the American Chemical Society.

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