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Restoration of aux1 gravitropism by 1-NAA coincides with basipetal auxin redistribution. Root gravitropic phenotype of aux1-100 (A,C,E,G,I) and corresponding IAA2∷uidA reporter expression pattern (B,D,F,H,J) when grown in the absence (A,B) or presence of 10−8 M 1-NAA (C,D), 10−7 M 1-NAA (E,F), 10−8 M 2,4D (G,H), or 10−7 M 2,4D (I,J). Scale bars in A,C,E,G,I, 2 mm; B,D,F,H,J, 50 μm.
