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In situ detection of H2O2 production by the DAB-uptake method in the MPAO and PCuAO transgenic tobacco plants. Leaves from wild-type (B, D, and G) and MPAO (A and E) or PCuAO (C and F) transgenic plants were supplied with DAB for 18 h in the absence (E–G) and in the presence of 1 mm Spd (A and B) or 1 mm Put (C and D).
