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Hydrogen peroxide location in root tissues using DAB. Zone I (A and B, arrows indicate the beginning of the staining in the stele) and zone II (C and D; E and F are magnifications of the boxed area in C and D) of Brassica oleracea roots grown under control conditions (A, C, and E) and with 80 mM NaCl (B, D, and F) during 14 d.
