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Video Caption: Video depicting the journey of nitrogen from
atmospheric gas into the cells of a shipworm through the fixation of
nitrogen by individual bacteria. It zooms from the whole organism to
the gill region, first showing a region containing many bacteria and
elevated levels of the 15N tracer isotope. It then zooms into a region
that has no bacteria but still has elevated 15N levels, indicating
that the nitrogen is being used by the shipworm in its own metabolism.
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