Heterocyst

Heterocysts are specialized cells found in certain species of filamentous cyanobacteria. They are responsible for the conversion of nitrogen gas (N2) into a form that can be used by the organism for growth and development, such as nitrates or ammonium. This process, called nitrogen fixation, is essential for the survival of many plants _____ __________ ___ ________ _______ ____ _______ ______ ________.
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