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<p><b>Guanine nucleotide exchange factors</b> (<b>GEFs</b>) are proteins or protein domains that activate monomeric <a href="page.php?w=GTPases">GTPases</a> by stimulating the release of <a href="page.php?w=guanosine_diphosphate">guanosine diphosphate</a> (GDP) to allow binding of <a href="page.php?w=guanosine_triphosphate">guanosine triphosphate</a> (GTP).  A variety of unrelated <a href="page.php?w=structural_domain">structural domain</a>s have been shown to exhibit guanine nucleotide exchange activity. Some GEFs can activate multiple GTPases</p><p>
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