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A peptide is a chemical compound having two or even more amino acids (amino acid polymers) that are coupled by a Peptide Bond peptide bond. This bond is an unique linkage where the nitrogen atom of one amino acid binds to the carboxyl carbon atom of one more.

Peptides are often classified inning accordance with the number of amino acid residues. Oligopeptides have 10 or fewer amino acids. Molecules being composed from 10 to 50 amino acids are called peptides. The term protein defines particles with more than 50 amino acids.
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