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

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

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