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Generation of the microbicidal oxidative burst in human neutrophils requires participation of four proteins, a membrane bound flavocytochrome b-558, two soluble proteins termed p47-phox and p67-phox, and the Ras-related GTPase Rac. Because plant cells exposed to pathogens produce a similar oxidative burst, we have looked for similarities between the oxidase complexes of the two systems. Antibodies...