Peptide

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A tetrapeptide (example Val-Gly-Ser-Ala) wi
green marked amino end (L-Valine) an
blue marked carboxyl end (L-Alanine).

Peptides (frae Gr. πεπτός, "digested", derived frae πέσσειν, "tae digest") are short chains o amino acid monomers airtit bi peptide (amide) bonds.