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Transport assay of SlABCB4 in Nicotiana benthamiana protoplast. Export assay of (A) indole-3-acetic acid (IAA) and (B) benzoic acid (BA). IAA and BA transport activities in Nicotiana benthamiana protoplast, expressing SlABCB4, SlABCB4-GFP or GFP-SlABCB4 and vector control, were measured. Error bars show standard error for at least four experimental repeats. The asterisk is significant at p < 0.05.
