The model of a DNA stands on a desk during a press conference to announce the winners of the Nobel Prize in Chemistry 2015 on Wednesday at the Royal Swedish Academy of Sciences in Stockholm. Sweden's Tomas Lindahl, Paul Modrich of the US and Turkish-American Aziz Sancar won the Nobel Chemistry Prize for work on how cells repair damaged DNA.
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Joseph Sledge, 70, addresses members of the media after being released from jail in Columbus County, N.C., on Friday. He served nearly four decades behind bars for two slayings he didn't commit.
An undated photo of Andre Davis provided by the Illinois Department of Corrections before his release in July 2012 on exculpatory DNA evidence. Davis is now facing a new murder charge.
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