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<p>also be called a residue, which indicates a repeating unit of a polymer. Proteins form by amino acids undergoing <a href="page.php?w=condensation_reaction">condensation reaction</a>s, in which the amino acids lose one <a href="page.php?w=water_molecule">water molecule</a> per <a href="page.php?w=chemical_reaction">reaction</a> in order to attach to one another with a <a href="page.php?w=peptide_bond">peptide bond</a>. By convention, a chain under 30 amino acids is often identified as a <a href="page.php?w=peptide">peptide</a>, rather than a protein.</p><p>
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