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Ammonium assimilation is a vital process in plants, as ammonium ions serve as an important source of nitrogen for the synthesis of amino acids, nucleotides, and other nitrogenous compounds. Although ammonium can arise from nitrate reduction, biological nitrogen fixation, photorespiration, and protein turnover, free ammonium is toxic to plant cells. Therefore, plants rapidly assimilate ammonium into organic forms through the GS-GOGAT pathway, which is the principal and most efficient mechanism for ammonium _______ ____ _________ _____ _______ ______ __________ __________ __________.
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