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Schematic representations of reactions proposed to be occurring during ZRA experiments shown in Fig. 1. Numbers shown in parentheses next to arrows indicate the proposed reactions shown at the top. Blue ovals represent S. oneidensis cells. Arrows on ZRA lines indicate the direction of electron transfer, as indicated by current in Fig. 1. Amorphous Fe(III) (hydr)oxide is depicted as amFe(OH)3.
