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The rice stem transversal section showing the crown root initiation area. Staining: periodic acid-Schiff and naphtol-blue-black. CRP: crown root primordium; Ep: epidermis; En: endodermis; GM: ground meristem; L: leaf; S: stele; VB: vascular bundle. The black dotted lines indicate the separation of the ground meristem. Scale bar, 50 µm.
