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<p>the protein's <a href="page.php?w=C-terminus">C-</a> or <a href="page.php?w=N-terminus">N-</a> termini. They can expand the chemical set of the 22 <a href="page.php?w=proteinogenic_amino_acid">amino acids</a> by changing an existing <a href="page.php?w=functional_group">functional group</a> or adding a new one such as phosphate. <a href="page.php?w=Phosphorylation">Phosphorylation</a> is highly effective for controlling the enzyme activity and is the most common change after translation. Many <a href="page.php?w=eukaryotic">eukaryotic</a> and</p><p>
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