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<p>molecules act as <a href="page.php?w=Ligand_%28biochemistry%29">ligands</a> that can increase or decrease <a href="page.php?w=Allosteric_regulation">enzyme activity</a>, <a href="page.php?w=gene_expression">gene expression</a>, influence <a href="page.php?w=cell_signaling">cell signaling</a>, or other protein functions. An example of such an effector is oxygen, which is an <a href="page.php?w=Allosteric_regulation">allosteric</a> effector of <a href="page.php?w=hemoglobin">hemoglobin</a> - oxygen binding to one of the four hemoglobin subunits</p><p>
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