Urea cycle occurs in
Inside the cells of almost all tissues,transamination of amino acids produce glutamic acid. How ever , Glutamate dehydrogenase is available only in liver. Therefore ,the final deamination and production of ammonia is taking place in Liver.Which fuher enters Urea cycle.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 203
Liver
Gastrointestinal tract
Spleen
Kidney
Metabolism of protein and amino acid