When proteins undergo deamination the waste substance found in urine is mostly what?

The waste substance found in urine when proteins undergo deamination is urea. Deamination is the process of removing an amino group from an organic compound, such as an amino acid. In humans, the deamination of amino acids occurs primarily in the liver. The amino groups removed during deamination are converted to ammonia (NH3). Ammonia is toxic and must be detoxified before it can be excreted from the body. Detoxification of ammonia occurs in the liver, where it is converted to urea. Urea is transported in the bloodstream to the kidneys and excreted in urine.