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Photographs and confocal micrographs demonstrating progress of colonization over 4 days under aerobic conditions with no supplemented iron (A) and over 9 days in an oxic/anoxic gradient with supplemented iron (B). All confocal micrographs are at ×200 magnification, showing a 300-μm by 300-μm area of the slide incubated at 35-mm depth.
