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Growth stimulation by ferric enterobactin. ○, FA1090 with no added ferric enterobactin; solid symbols, cultures containing 10 μM enterobactin. ●, FA1090 (wild type); ■, FA6959 (fetA::Ω); ⧫, FA6990 (tonB::cat); ▴, FA7015 (fetB::Ω). The graph is representative of a minimum of three experiments.
