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Romesberg, Malyshev and their colleagues are now working on tweaking NaM and 5SICS so that natural DNA strands with those synthetic bases added will copy even more efficiently, at a rate that's closer to the rate found in all-natural DNA, they wrote in their paper. Once they accomplish that, they can start building synthetic organisms from the ground up. "If we can get this new base pair to replicate with high efficiency and fidelity in vivo [i.e., in a living organism], we'll have a semi-synthetic organism," Romesberg said.
Haven't they ever seen the movie?