Deamination of amino acids in the liver produces urea.
When proteins are broken down in the body, the amino acids are transported to the liver for processing. In the liver, enzymes remove the amino group from the amino acids, a process called deamination. This produces ammonia, which is toxic to the body. To get rid of the ammonia, the liver converts it into a less toxic compound called urea, which can be safely transported to the kidneys for excretion in urine.
Therefore, the liver plays a crucial role in removing excess nitrogen from the body, and the production of urea is an important part of this process.