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Tubes from agar dilutions inoculated with S. deleyianum after 3 weeks of incubation. The medium was solidified with 1% agar and contained acetate, formate, biologically produced ferrihydrite, cysteine, and thiosulfate (0.05 mM). Arrows point to white zones, which indicate ferrihydrite reduction. Note, white stripes (*) originate from flash light reflections.
