Heterocyst is a structure which is associated with
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Heterocysts are specialized nitrogen-fixingcells formed during nitrogen starvation by some filamentous cyanobacteria, such asNostoc punctiforme, Cylindrospermum , andAnabaena sphaerica. They fix nitrogen from dinitrogen (N2) in the air using the enzymenitrogenase, in order to provide the cells in the filament with nitrogen for biosynthesis.[1]Nitrogenase is inactivated by oxygen, so the heterocyst must create a microanaerobic environment. The heterocysts' unique structure and physiology require a global change in gene expressi
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Heterocyst is found in nostoc a filamentous bga which helps in nitrogen fixation.
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