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SOD activity in soybean cells agitated at 60 rpm 4 h postinoculation with P. syringae pv. glycinea carrying avrA: black bars, total SOD; white bars, Cu,Zn-SOD. DDC was added 15 min in advance to a final concentration of 2 mM. Each datum point is the mean and standard deviation of three replicates. Experiments were repeated twice with similar results.
