Mechanosensitive ion channels from bacteria open like an iris, with the transmembrane helices tilting into the membrane to make a thin, wide structure with a 3 nm pore.
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Sachs, F. Retaining your identity under stress. Nat Struct Mol Biol 9, 636–637 (2002). https://doi.org/10.1038/nsb0902-636
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DOI: https://doi.org/10.1038/nsb0902-636
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