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Persistent shade increases auxin signaling despite the reduced auxin levels. (A) DII fluorescence in epidermal and subepidermal tissues of the hypocotyl. (B and C) GUS staining driven by DR5:GUS in the hypocotyl of seedlings of the Columbia wild type and of the mir393ab mutant background. (In C, scale bar = 200 μm.) Means ± SE of (A) 40 or (B) 8 biological replicates, and (C) representative images. **P < 0.01; ***P < 0.001.
