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<p>These changes are largely due to highly controlled modifications in <a href="page.php?w=gene_expression">gene expression</a> and are the study of <a href="page.php?w=epigenetics">epigenetics</a>. With a few exceptions, cellular differentiation almost never involves a change in the <a href="page.php?w=DNA">DNA</a> sequence itself. Metabolic composition, however, gets dramatically altered where stem cells are characterized by abundant metabolites with highly unsaturated structures whose levels decrease upon differentiation. Thus, different cells</p><p>
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