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Protein interaction assays between IbWRKY2 and VQ4. (a) Yeast two-hybrid assay showing the interaction between IbWRKY2 and VQ4 proteins from sweetpotato and Arabidopsis; pGBKT7 and pGADT7 plasmids served as negative controls. (b) BiFC visualization of the interaction between IbWRKY2 and VQ4 proteins from sweetpotato and Arabidopsis in tobacco leaves.
