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Auxin distribution in the Arabidopsis root of the DR5 line 6 h after treatment. Seedlings were exposed to 2.5 mM MES (control) or control medium supplemented with 200 mM mannitol or 100 mM NaCl. GFP fluorescence was imaged with a Leica TCS SP8 X laser scanning confocal microscope. Bar: 10 μm.
