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Key points from article :
Bacterium's DNA modified to incorporate six letters instead of four.
E. coli bug could hold on to the synthetic code.
Proteins created contained "unnatural" amino acids.
No loss of efficiency compared with natural protein synthesis.
Novel proteins could form basis of new treatments and novel materials.
The study was published in the Nature journal.
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Scientific journal covering research from a variety of academic disciplines, mostly in science and technology
Medical research facility with focus on research and education in the biomedical sciences
