UREA - a colorless crystalline compound which is the main nitrogenous breakdown product of protein metabolism in mammals and is excreted in urine, NITROGEN - chemical element present in the cycle in the form of ammonia, which is converted into urea with atomic number 7 , AMMONIA - toxic product of nitrogen metabolism that is produced from the breakdown of protein and from dietary sources, ELIMINATION - the ______ of excess nitrogen from the body is the primary purpose of the urea cycle, ENZYMES - proteins that catalyze chemical reactions in the urea cycle, CATABOLISM - the sequences of enzyme-catalyzed reactions by which relatively large molecules in living cells are broken down, PROTEIN - complex molecule made up of amino acids that plays many critical roles in the body, ATP - the source of energy for use and storage at the cellular level,

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