The Arginine reference article from the English Wikipedia on 24-Jul-2004
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Arginine

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Arginine is one of the 20 most common natural amino acids on Earth, and coded for by DNA. In non-hepatic tissues, arginine can be biosynthesized by the ornithine cycle (or urea cycle). Even so, arginine is often classed as one of the 10 essential amino acids. This need evidently is restricted to children.