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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 a special linkage where the nitrogen atom of one amino acid binds to the carboxyl carbon atom of one more.

Peptides are often classified according to the number of amino acid residues. Oligopeptides have 10 or fewer amino acids. Molecules consisting from 10 to 50 amino acids are called peptides. The term protein explains molecules with greater than 50 amino acids.
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