The movement of proteins through a cell's membrane requires a dedicated molecular machine. A glimpse of this apparatus in action shows that it has two channels, and hints at how these pores might be regulated.
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Driessen, A. Two pores better than one?. Nature 438, 299–300 (2005). https://doi.org/10.1038/438299a
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DOI: https://doi.org/10.1038/438299a
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