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Nitrogen is often a limiting nutrient for the growth of plants and
microorganisms. The
Kranz lab studies how genes responsible for nitrogen fixation are
regulated in the photosynthetic bacterium Rhodobacter capsulatus. Using a
lacZ gene fused to a gene involved in nitrogen regulation, the figure shows
that this gene is only expressed (blue color) when nitrogen is needed, namely
in the absence of NH3 in the medium.
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