A cell's contents are organized by a scaffolding of microtubules. These long, thin polymers continuously grow and shrink, and the structures of two forms of the constituent protein provide clues to how this occurs.
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Mahadevan, L., Mitchison, T. Powerful curves. Nature 435, 895–897 (2005). https://doi.org/10.1038/435895a
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DOI: https://doi.org/10.1038/435895a
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