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Cantharidin inhibits PIN1 dephosphorylation. Representative confocal fluorescence microscopy images of primary roots after immunostaining of 4-d-old PIN1:GFP Arabidopsis seedlings following BFA (50 µM, 10 min) and cantharidin or mock (30 min) treatments with anti-GFP (a-GFP, PIN1:GFP), a-PIN1 S1-P (A) or a-PIN1 S4-P (B) antibodies. (Scale bar, 50 µm.)
