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aerE encodes an MFS transporter that exports aerobactin. A. CAS assay quantitation of siderophore in culture fluids collected from the indicated V. fischeri ES114 strains grown in minimal marine medium. B. CAS assay quantitation of intracellular siderophore levels in the strains from A. In A and B, error bars represent standard deviations for three biological replicates. Unpaired two-tailed t tests were performed comparing mutants to WT. P values: ns ≥ 0.05, *** < 0.001, **** < 0.0001.
