Anfinsen's principle tells us that the folded structure of a protein is determined solely by its sequence. Now, it has been shown that the rate at which a polypeptide chain is synthesized in the cell can affect which of two alternative folded structures it adopts.
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Sivertsson, E., Itzhaki, L. When ribosomes pick the structure. Nature Chem 6, 378–379 (2014). https://doi.org/10.1038/nchem.1926
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DOI: https://doi.org/10.1038/nchem.1926
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