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==Description==
==Description==
'''Ammonia''' is a by-product of protein degradation which is transported in the portal vein and metabolised to urea in the liver via the urea cycle. Some ammonia is also used in the synthesis of glutamine. Ammonia is generated in normal animals through the following physiological processes:
'''Ammonia''' is a by-product of protein degradation which is transported in the portal vein and metabolised to urea in the liver via the urea cycle. Some ammonia is also used in the synthesis of glutamine. Ammonia is generated in normal animals through the following physiological processes: