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Cellular morphology after ethidium bromide incubation. Shown are representative images of filaments of Anabaena wild type (left) of AFS-I-hgdD (right) incubated for 30 min with the indicated concentration of ethidium bromide. No obvious alteration of filament structure or length and no obvious alteration of the cellular integrity were realized. BF, bright field; AF, autofluorescence; scale bar, 10 μm.
