What is hetrocyst . write its functions.
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heterocyst is a differentiated cyanobacterial cell that carries out nitrogen fixation. The heterocysts function as the sites for nitrogen fixation under aerobic conditions. They are formed in response to a lack of fixed nitrogen (NH4 or NO3).
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Hetrocyst is the site of nitrogen fixation. It contains the enzyme nitrogenase. Hetrocyst are present in filaments of cynobacteria and appear as thick walled, colourless and slightly elarged cells.
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