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Antioxidant enzyme activity determination. Quantitative analysis of (A) superoxide dismutase (SOD), (B) peroxidase (POD), (C) and catalase (CAT) activity in wild-type and transgenic plants treated with or without 50 μM copper chloride (CuCl2) for 24 h. Values are means ± standard deviation (SD) of three independent experiments; * p < 0.05 and ** p < 0.01 indicate significant differences from wild-type plants under the same conditions determined using the Student’s t-test.
