A. Representative growth curves of WT (CU1065), ΔpfeT, ΔpfeT Pspac-pfeT, and ΔpfeT Pspac-frvA grown in LBC medium with no added iron.
B. Representative growth curves of the same strains as panel (A) in LBC medium amended with 4 mM FeSO4. For IPTG treated cells, 1 mM IPTG was added to cell cultures 30 min before 2 μl of cell culture was inoculated to 200 μl of growth medium.