Roots must sort the good from the bad and distinguish the inside from the outside. In endodermal cells, a ring-like apoplastic diffusion barrier called the Casparian strip is established, splitting the cells down the middle into inner and outer lateral halves. Its integrity and polarity depends on a novel protein kinase called SCHENGEN1.
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Velasquez, S., Kleine-Vehn, J. Cell biology: Zipping the Casparian strip. Nature Plants 2, 16118 (2016). https://doi.org/10.1038/nplants.2016.118
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DOI: https://doi.org/10.1038/nplants.2016.118
