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<p>as <a href="page.php?w=phosphorylation">phosphorylation</a>s and <a href="page.php?w=glycosylation">glycosylation</a>s are usually also considered a part of the primary structure, and cannot be read from the gene. For example, <a href="page.php?w=insulin">insulin</a> is composed of 51 amino acids in 2 chains. One chain has 31 amino acids, and the other has 20 amino acids.</p>

<p><big>Secondary structure</big></p>
<p><a href="page.php?w=Secondary_structure">Secondary structure</a> refers to highly regular local sub-structures on the actual polypeptide</p><p>
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