Cluster of anaerobic methane consuming archaea (red) and sulfate reducing bacteria (green). This cluster of cells has been labeled with two ribosomal rRNA probes that target these two specific groups and have fluorescent molecules attached that show up as different colors when viewed with a special microscope.

A cluster of anaerobic methane-consuming archaea (red) and sulfate-reducing bacteria (green). This cluster of cells has been labeled with two ribosomal rRNA probes that target these two specific groups and have fluorescent molecules attached that show up as different colors when viewed with a special microscope. Photo courtesy of Victoria Orphan, California Institute of Technology.

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