Amino Acid Count
Location: Outside U.S.
Date: Spring 2010
Are there more than 20 amino acids on earth?
Twenty-two amino acids are naturally incorporated into polypeptides and are
called proteinogenic or standard amino acids.
Aside from the twenty-two standard amino acids, there are also a vast number
of "non-standard" amino acids.
Please see the following URL for full coverage of this question.
Yes, but only 20 that are commonly occurring in proteins.
Ron Baker, Ph.D.
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Update: June 2012