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Activities of the truncated icsP promoter series in Shigella. Bars indicate β-galactosidase expression of the PicsP-lacZ fusions in wild-type S. flexneri (2457T) and an isogenic strain lacking virB (AWY3). β-Galactosidase activities are expressed in Miller units. Assays were run in triplicate, and the means and standard deviations of the results are shown.
