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

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Chemical structure of lysine

Lysine is one of the 20 most common natural amino acids on Earth. Lysine is directly coded for in DNA and molecular biologists tend to abbreviate it to Lys or K. Nutritionally, in humans, lysine is an essential amino acid. Lysine can be used as a nutritional supplement to help against herpes.

Lysine is the limiting amino acid in all cereal grains, but is plentiful in all pulses. A deficiency in Lysine can result in a deficiency in niacin (which is a B Vitamin). This can cause the disease pellagra. Plants that contain significant amounts of lysine include: