Word Count : 193

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A heterocyst is a specialized, thick-walled cell found in certain filamentous cyanobacteria, such as *Anabaena* and *Nostoc*, which is differentiated from vegetative cells for the purpose of nitrogen fixation. These cells provide an anaerobic environment necessary for the _____ ___ ________ __________ ____ ______ ___ _________ ___ ___.
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