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<p>The <b>cluster of differentiation</b> (also known as <b>cluster of designation</b> or <b>classification determinant</b> and often abbreviated as <b>CD</b>) is a protocol used for the identification and investigation of <a href="page.php?w=cell_surface_molecule">cell surface molecule</a>s providing targets for <a href="page.php?w=immunophenotyping">immunophenotyping</a> of cells. In terms of physiology, CD molecules can act in numerous ways, often acting as <a href="page.php?w=receptor_%28biochemistry%29">receptors</a> or <a href="page.php?w=ligand_%28biochemistry%29">ligands</a></p><p>
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