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Immunogold localization of HrpZ (viewed as black electron‐dense dots) coating the HrpA pilus (top arrow) of Phaseolus syringae pv. tomato DC3000. A curved flagellum (bottom arrow) containing flagellin, which activates basal defences through the receptor FLS2 (Felix and Boller, 2009), is also shown, but is not associated with HrpZ. Image kindly provided by Ian Brown (see also Li et al., 2002).
