Two new letters have been added to the genetic code, reports Philip Ball.
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References
Wu,Y. et al. Efforts towards expansion of the genetic alphabet: optimization of interbase hydrophobic interactions. Journal of the American Chemical Society 122, 7621 - 7632 2000.
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Ball, P. Augmenting the alphabet. Nature (2000). https://doi.org/10.1038/news000831-6
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DOI: https://doi.org/10.1038/news000831-6