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A peptide is a chemical substance having 2 or more amino acids (amino acid polymers) that are coupled by a Peptide Bond peptide bond. This bond is an unique link in which the nitrogen atom of one amino acid binds to the carboxyl carbon atom of one more.
Peptides are commonly classified according to the number of amino acid deposits. Oligopeptides have 10 or fewer amino acids. Molecules consisting from 10 to 50 amino acids are called peptides. The term protein describes particles with more than 50 amino acids.
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