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Fig. 2. Alignment of cell walls is defective in the meristems of erh3 mutant roots. Wild type (A,C,E), erh3-2 (B,D,F). Medial longitudinal sections (A,B). Transverse sections (C,D). Organisation of epidermal cells (E,F). a, atrichoblast (meristematic cell that will form a non-hair cell); t, trichoblast (meristematic cell that will form a hair cell). Scale bar, 100 µm.