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Tolerance of transgenic and WT plants to Cd2+ or Zn2+ stress. WT: Wild−type tobacco. N13, N14, N24: Three homozygous transgenic tobacco lines (T2). Four−week−old transgenic lines and WT plants were grown under Zn2+ (0, 300, or 900 mg/kg) or Cd2+ (0, 100, or 200 mg/kg) for 3 weeks, respectively.
