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<card id="card1" title="Protein quaternary structure - Page 2 - Wikipedia">
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<p>It includes organizations from simple <a href="page.php?w=protein_dimer">dimers</a> to large <a href="page.php?w=homooligomer">homooligomer</a>s and <a href="page.php?w=multiprotein_complex">complexes</a> with defined or variable numbers of subunits. In contrast to the first three levels of protein structure, not all proteins will have a quaternary structure since some proteins function as single units. Protein quaternary structure can also refer to <a href="page.php?w=biomolecular_complex">biomolecular complex</a>es of proteins with <a href="page.php?w=nucleic_acid">nucleic acid</a>s</p><p>
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