FIG 2.

(A to C) Growth (OD₅₆₅) and magnetic response (C_mag) of MSR-1 WT, Δcbb₃, and Δaa₃ Δcbb₃ strains under different conditions. (A) Aerobic conditions in nitrate medium; (B) aerobic conditions in ammonium medium; (C) microaerobic conditions in ammonium medium. (D) TEM images of microaerobically grown WT (i), Δcbb₃ mutant (ii), and Δaa₃ Δcbb₃ mutant (iii) strains in ammonium medium. Bars, 500 nm (whole cells) and 100 nm (magnetosomes). (E) Measurements of crystal sizes for MSR-1 WT, Δcbb₃, and Δaa₃ Δcbb₃ strains at different time points in microaerobic ammonium medium. Results from representative experiments were determined in triplicate, and values are given as means and standard deviations.