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DAO1 promoter is mainly active in roots. Visualization of pDAO1:GUS activity in (A) the root, (B) the aerial portion, (C) the stele, (D) epidermal cells in the mature part of the root, (E and F) RHs, and (G) the root tip. Pictures were taken from (A and E–G) 7-, (B) 4-, and (C and D) 5-d-old seedlings. (Scale bars: A, 500 μm; B and E–G, 100 μm; C and D, 50 μm.)
