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The effect of auxins on DR5-GUS expression in the roots of mock-treated 4-day-old seedlings. Seedlings were treated for 90 min with mock (A), 10 μM IAA (B), and 10 μM 1-NAA (C), then transferred to a GUS staining solution and incubated for 220 min. Scale bars represent 100 μm. Quantification of GUS histochemical staining (D). Data are means of nine seedlings; error bars represent SD. Means with different letters are significant (p < 0.05).
