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The compounds inhibit auxin transcriptional activation in the BA3 and DR5::GUS reporter lines. Five-day-old BA3 (A and B) or DR5::GUS (C and D) seedlings were subjected to the indicated concentrations of IAA and compound for 4 h, followed by staining with X-gluc (A and C) or fluorimetric determination of GUS activity (B and D). Error = SE of the mean (n = 6).
