Comment on location and function of heterocysts.
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Heterocyst is a specialized cell found in nitrogen-fixing cyanobacteria. Heterocysts are enlarged cells with thick cell walls and they lack chlorophyll, giving them a colourless appearance. They are the site of nitrogen fixation, for which they produce the enzyme nitrogenase.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). The morphological differentiation is accompanied by biochemical alterations. The mature heterocysts contain no functional photosystem II and cannot produce oxygen.
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