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Growth (▪) and magnetism (•) of M. gryphiswaldense strains MSR-1 (wild type) and MSR-1B (nonmagnetic mutant) in the oxystat at microaerobic conditions (0.25 mbar of O2). (A) MSR-1B, <1 μM Fe; (B) MSR-1, <1 μM Fe; (C) MSR-1B, 80 μM Fe; (D) MSR-1, 80 μM Fe.
