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Representative scanning electron micrographs of the cotyledons (A) and epidermal cells (B) of 3-day-old sunflower seedlings that were grown in darkness. The peripheral cells (B) were photographed in the area indicated by the arrow (A). C, cotyledons; E, epidermal cells; S, open stomatum with open pore. Bars = 1 mm (A), 50 µm (B).
