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Transmission electron microscopy observations of wild-type AMB-1 cells cultivated for 3 days with initial iron concentrations in the growth medium of 30 (A) or 150 (B) μM and ΔmamP (C) and ΔmamTΔR9 (referred to as ΔmamT) (D) AMB-1 strains cultivated with Fe(III)-citrate at 150 μM. The scale bars within the insets represent 50 nm.
