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Trace metals-induced O2−∙ and H2O2 production in B. juncea var. Malopolska roots. Fluorescent images of B. juncea roots grown in Hoagland’s medium in the presence of 50 μmol of Pb(NO3)2, CuSO4, CdCl2, and ZnSO4 for 24 h and control roots of plants stained with DHE for 12 h (A) and DCFH-DA for 4 h (B). The bar indicates 1 μm.
