A standard DNA molecule. Floyd Romesberg and his team have expanded the genetic code from four letters to six by adding two new molecules they call X and Y. Photograph: Deco Images II / Alamy/Alamy
https://www.theguardian.com/science/2017/jan/23/organisms-created-with-synthetic-dna-pave-way-for-new-entirely-new-life-forms
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