Embryos have two distinct ends, which become apparent early on. Quite how this initial polarity is sustained in plant embryos has been unclear. Step forward the agent provocateur of plant development — auxin.
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Kepinski, S., Leyser, O. An axis of auxin. Nature 426, 132–135 (2003). https://doi.org/10.1038/426132b
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DOI: https://doi.org/10.1038/426132b
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