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<p>Moreover, human and yeast ubiquitin share two conserved <a href="page.php?w=Salt_bridge_%28protein%29">salt bridges</a>, K11-E34 and K27-D52, which are critical for protein stability and function.</p>

<p><big> Genes </big></p>
<p>Ubiquitin is encoded in mammals by four different genes. <a href="page.php?w=Ubiquitin_A-52_residue_ribosomal_protein_fusion_product_1">UBA52</a> and <a href="page.php?w=RPS27A">RPS27A</a> genes code for a single copy of ubiquitin fused to the <a href="page.php?w=Ubiquitin_A-52_residue_ribosomal_protein_fusion_product_1">ribosomal proteins L40</a></p><p>
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