These days, it often seems like science is catching up with fiction. Three years ago an entire genome was transplanted from one bacterium to another. Later, the same technique was used to kick-start an enucleated cell by supplying it with a manmade genome, showing that life can be artificially assembled in the lab. Now, researchers are aiming to rewrite the genetic code altogether, changing the amino acids specified by various DNA triplet codes, a relationship thought to have been fixed by years of evolution.
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