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The GUS activities in total cellular protein extracts (a) and in culture supernatants (b) of Xanthomonas campestris pv. campestris strain 8004/pLGUS0241 incubated for 20 hours in four minimal media (XVM2, XOM2, MMX, and MME) at different pH levels. Values given are the means and standard deviations of triplicate measurements. Data presented were from a representative experiment and similar results were obtained in two other independent experiments.
