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<p>or the activation of <a href="page.php?w=GPCR_oligomer">G protein-coupled receptor hetero-oligomer</a> subunits, among other mechanisms.</p>

<p><big> Natural transactivation </big></p>
<p>Transactivation can be triggered either by endogenous cellular or viral proteins, also called <b>transactivators</b>.  These protein factors <a href="page.php?w=Trans_acting">act in trans</a> (i.e., <a href="page.php?w=intermolecular">intermolecular</a>ly). <a href="page.php?w=HIV">HIV</a> and <a href="page.php?w=HTLV">HTLV</a> are just two of the many viruses that</p><p>
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