The Asparagine reference article from the English Wikipedia on 24-Apr-2004
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Asparagine

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Asparagine is one of the 20 most common natural amino acids on Earth.

A byproduct of the breakdown of asparagine (asparagine-amino-succinic-acid monoamide) is also blamed for the smell in some people's urine after they have eaten asparagus. (Some scientists disagree and implicate other substances in the smell, especially methyl mercaptan.)