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(A and B) Growth rates of the MSR-1 WT, ΔirrB (irrB-deficient mutant), and CF3149 strains in culture with 30 μM DIPy (low-iron conditions) (A) or 60 μM ferric citrate (high-iron conditions) (B). (C) Magnetic responses (Cmag) under high-iron conditions. The ΔirrB strain showed clear reductions in the levels of growth and magnetosome formation under low-iron conditions.
