Tripeptide

A tripeptide is a peptide derived from three amino acids joined by two or sometimes three peptide bonds.

[1] As for proteins, the function of peptides is determined by the constituent amino acids and their sequence.

In terms of scientific investigations, the dominant tripeptide is glutathione (γ-L-Glutamyl-L-cysteinylglycine), which serves many roles in many forms of life.

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A tripeptide (example Val - Gly - Ala ) with
green marked amino end ( L-Valine ) and
blue marked carboxyl end ( L-Alanine )