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Histochemical staining of GUS activity in DR5-GUS transgenic Arabidopsis seedlings in response to IAA or BL treatment. Seven-day-old DR5-GUS transgenic seedlings were mock treated (A), treated with 10 nm BL for 12 h (B), treated with 1 μm IAA (C), or treated with 50 nm IAA (D) for 12 h. Seedlings were stained for 24 h for GUS activity in staining buffer containing 1 mm 5-bromo-4-chloro-3-indolyl-β-d-glucuronide.
