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IsdA protects against the growth-inhibiting effect of aLf. Symbols: ▪, Newman (wild type); ×, SRC105 (isdA); ⧫, Newman plus 1 μM aLf; ▴, SRC105 plus 1 μM aLf. The values are the means of three independent experiments. The data for strains Newman and SRC105 overlap extensively. O.D. 600, optical density at 600 nm.
