• Chief end product of mammalian protein metabolism, formed in the liver from amino acids and compounds of ammonia; the chief nitrogenous compound of urine; an average person, in steady state of consuming average amounts of dietary protein, excretes about 30 grams of urea per day.
  www.epidemic.org/glossaryText/glossaryT-Z.html
• a waste product of the metabolism of proteins that is formed by the liver and secreted by the kidneys
  www.american-depot.com/services/resources_gl_u.asp
• One of the chief waste products of the body. When the body breaks down food, it uses what it needs and throws the rest away as waste. The kidneys flush the waste fromthe body in the form of urea, which is in the urine.

aspin.asu.edu/geneinfo/glos-u.htm

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