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Spatial relationship between gravity sensing tissue and elongation zone in roots and shoots. In a root (left), the gravity vector (g) is perceived in the columella cells in the root cap. A signal (arrow) is transmitted from the columella cells to the elongation zone in an apical-to-basal fashion. In an inflorescence stem (right), gravity sensing is carried out in the endodermal cells and a signal (arrow) is transmitted in an inner-to-outer fashion.
