Cells of the slime mould Dictyostelium discoideum can move in a kind of close-order drill. New evidence suggests that they do this by secreting a chemical attractant specifically from their rear, luring the cells that follow.
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Kessin, R. Making streams. Nature 422, 481–482 (2003). https://doi.org/10.1038/422481a
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DOI: https://doi.org/10.1038/422481a
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