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Oligopeptide
Peptide consisting of two to twenty amino acids / From Wikipedia, the free encyclopedia
An oligopeptide (oligo-, "a few"), is a peptide consisting of two to twenty amino acids, including dipeptides, tripeptides, tetrapeptides, and other polypeptides. Some of the major classes of naturally occurring oligopeptides include aeruginosins, cyanopeptolins, microcystins, microviridins, microginins, anabaenopeptins, and cyclamides. Microcystins are best studied because of their potential toxicity impact in drinking water.[1] A review of some oligopeptides found that the largest class are the cyanopeptolins (40.1%), followed by microcystins (13.4%).[2]
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green marked amino end (L-Valine) and
blue marked carboxyl end (L-Alanine)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/0/08/Tetrapeptide_structural_formulae_v.1.png/640px-Tetrapeptide_structural_formulae_v.1.png)
green marked amino end (L-valine) and
blue marked carboxyl end (L-alanine)