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AtHB7 and AtHB12 might act in homodimer or heterodimer in response to Al stress. (A) AtHB7 and AtHB12 could form homodimer and heterodimer showed by yeast two-hybrid assay. (B) Relative root growth of wild type, athb7, athb12 and athb7/athb12 double mutant in response to Al treatment. Data are means ± SD (n = 30). Asterisks indicate significant differences between wild type and mutants at *: p < 0.05 by Tukey’s test.
