The encoding of two non-universal amino acids involves dynamic redefinition of 'stop' signals in the genetic code. Bacteria with multiple proteins containing these amino acids add to our appreciation of coding versatility.
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Atkins, J., Baranov, P. Duality in the genetic code. Nature 448, 1004–1005 (2007). https://doi.org/10.1038/4481004a
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DOI: https://doi.org/10.1038/4481004a
