Newly made proteins are moved across cellular membranes through a protein channel. The crystal structure of this channel is now revealed and confirms expectations that it must change shape to allow proteins to pass.
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Benach, J., Hunt, J. Shape-shifting protein channel. Nature 427, 24–25 (2004). https://doi.org/10.1038/427024a
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DOI: https://doi.org/10.1038/427024a