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Peroxidase activity in atprx71 and qua2-1 mutants. Total proteins were extracted from 10-d-old in vitro-grown seedlings (A) or rosette leaves from 4-week-old soil-grown plants (B) and assayed for peroxidase activity. Bars represent average enzyme activity (nanokatal milligram−1 protein) ± sd (n = 3). Letters indicate significant differences according to one-way ANOVA followed by Tukey’s significance test (P < 0.05). 71-1, atprx71-1; 71-2, atprx71-2; WT, wild type.
