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Xenosiderophore-stimulated growth of FA19 and isogenic pilQ mutant. Strains FA19 (wild type [WT]) and MCV841 (pilQ) were grown in CDM containing 2.5 μM bovine transferrin, supplemented with either 7.5 μM human transferrin (positive control), 10 μM enterobactin, or 10 μM salmochelin S2. Each time point represents the mean and standard deviation of results from three independent experiments.
