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urea cycle  a cyclic series of reactions that produce urea; it is a major route for removal of the ammonia produced in the metabolism of amino acids in the liver and kidney.
Urea cycle. Diagrammatic representation of reactions by which excess nitrogen in the form of ammonia is converted to soluble urea, using l-ornithine as a recyclable carrier.

Urea cycle. Diagrammatic representation of reactions by which excess nitrogen in the form of ammonia is converted to soluble urea, using L-ornithine as a recyclable carrier.




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