The Proteinogenic reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Proteinogenic

The twenty amino acids that are coded in the standard genetic code are called proteinogenic (protein building).

Some of the 20 amino acids in the genetic code are called essential amino acids, because they cannot be synthesized by the body from other compoundss through chemical reactions, but instead must be taken in with food. In humans, the essential amino acids are lysine, leucine, isoleucine, methionine, phenylalanine, threonine, tryptophan, valine, and (in children) histidine and arginine.

Proline is the only cyclic proteinogenic amino acid.

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