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<p><b>GTPase-activating proteins</b> or <b>GTPase-accelerating proteins</b> (<b>GAPs</b>) are a family of regulatory proteins whose members can bind to activated <a href="page.php?w=GTP-binding_protein">G protein</a>s and stimulate their <a href="page.php?w=GTPase">GTPase</a> activity, with the result of terminating the signaling event.  GAPs are also known as <a href="page.php?w=Regulator_of_G_protein_signalling">RGS protein</a>, or RGS proteins, and these proteins are crucial in controlling the activity of G proteins.  Regulation of G proteins</p><p>
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