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Growth of wild-type (WT) and siz1 mutant seedlings under Cu stress. One-week-old wild-type (black circles) and siz1-2 (white circles) seedlings were treated with various Cu concentrations, as indicated, for 10 d before fresh weights (A) or for 3 d (vertical growth) before root lengths (B) were measured. The normalized value against the growth in half-strength MS medium is presented. Means and error bars were calculated from six repeats with 10 plants each.
