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Hormonal regulation of cell differentiation. (A) Morphological markers of cell differentiation are the emergence of the first epidermal (Ep) root hair, the xylem (Xy) lignification, the suberization of endodermal (En) cells and the presence of the Casparian strip. (B) Hormone regulation (black arrows) and crosstalk (dotted arrows) in each of the three differentiation processes.
