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The urea cycle is a vital metabolic pathway that converts toxic ammonia, produced during amino acid catabolism, into urea, which is less toxic and can be safely excreted in urine. This cycle occurs mainly in hepatocytes and involves reactions in both the mitochondrial matrix and cytosol. Ammonia arises from deamination of amino acids, intestinal bacterial activity, and other nitrogen-containing compounds, and even small increases in blood ammonia levels can be harmful to the central nervous system. The cycle begins in the mitochondria where free ammonia combines _____ __________ ____ ________ ______ ___ _______ ______ _________ __________.
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