The association between legumes and nitrogen-fixing bacteria requires molecular recognition to allow bacterial entry into root hairs. The discovery of a novel type of plant receptor clarifies how this happens.
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Parniske, M., Downie, J. Locks, keys and symbioses. Nature 425, 569–570 (2003). https://doi.org/10.1038/425569a
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DOI: https://doi.org/10.1038/425569a