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<p>These receptors are linked to a stimulative or inhibitory regulative <a href="page.php?w=G_protein-coupled_receptor">G-protein</a>. When a stimulative G-protein is activated, <a href="page.php?w=adenylyl_cyclase">adenylyl cyclase</a> <a href="page.php?w=Catalysis">catalyzes</a> ATP into cAMP by using Mg<sup>2+</sup> or Mn<sup>2+</sup>. cAMP, a secondary messenger, then goes on to activate <a href="page.php?w=protein_kinase_A">protein kinase A</a>, which is an <a href="page.php?w=enzyme">enzyme</a> that regulates cell <a href="page.php?w=metabolism">metabolism</a>.</p><p>
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