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Root length of wild-type (black), TcMT2a (light grey), or TcMT3 (dark grey) transformed Arabidopsis seedlings grown in 0.5 MS (control) or in 0.5 MS spiked with 400 μM ZnSO4, 40 μM CuSO4, or 15 μM CdSO4 for 11 d. The data are means of three plates (each containing 10 plants) of three independent TcMT2a or TcMT3 transformants. Error bars indicate ±SD. *Means significantly different from wild-type (two-way ANOVA, followed by a posteriori testing using the minimum significant range, MSR).
