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Chemists Expand Nature's Genetic Alphabet

03:55
Being able to insert the two man-made letters into DNA, alongside the usual four-letter alphabet, could teach old cells new tricks and lead to better drugs, researchers say. (courtesy of Synthorx)
Being able to insert the two man-made letters into DNA, alongside the usual four-letter alphabet, could teach old cells new tricks and lead to better drugs, researchers say. (courtesy of Synthorx)

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