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SEM images of wild-type G. sulfurreducens (A) and Δ1501 mutant (B) biofilms and wild-type (C) and Δ1501 mutant (D) biofilms fixed in the presence of cationic dye safranin O (bar, 5 μm). Field emission SEM images of wild-type (E) and Δ1501 mutant (F) biofilms (bar, 2 μm). All biofilms were grown on unpoised graphite electrodes.
