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Correlative fluorescence and electron microscopy reveal the identity and morphology of obligate multicellular magnetotactic bacteria (MMB) living in salt marsh sediment. Two distinct populations of MMB were identified using species-specific 16S rRNA targeted fluorescence in situ hybridization (FISH) probes and are highlighted in yellow and magenta. One multicellular consortium, shown in cyan, was only stained by DAPI and could not be taxonomically identified. MMB were deposited on a 0.2 micron filter. Copyright George Schaible