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Analysis of IAA accumulation in wild-type and aux1 Arabidopsis root apices. (A) High resolution IAA quantitation in Arabidopsis wild-type (●) and aux1 (□) root segments. (B) DIC image of whole-mount GUS-stained wild-type IAA2∷uidA root apex. (C) DIC image of whole-mount GUS-stained aux1 IAA2∷uidA root apex. (D) Radial section of GUS-stained wild-type IAA2∷uidA root apex. Scale bars, 50 μm.
