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<p>Many processes such as <a href="page.php?w=cell_division">cell division</a>, immune responses and embryonic development are also regulated by <a href="page.php?w=post-translational_modification">post-translational modification</a> by ubiquitin and ubiquitin-like proteins.</p>

<p><big>Ubiquitination (ubiquitylation)</big></p>
<p>Ubiquitin-activating enzyme (E1) starts the ubiquitination process (Figure 1).  The E1 enzyme, along with <a href="page.php?w=ATP_%28molecule%29">ATP</a>, binds to the ubiquitin protein.  The E1 enzyme then passes the ubiquitin</p><p>
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