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<p>Differentiation continues in adulthood as <a href="page.php?w=adult_stem_cell">adult stem cell</a>s divide and create fully differentiated <a href="page.php?w=Cell_division">daughter cells</a> during tissue repair and during normal cell turnover. Some differentiation occurs in response to <a href="page.php?w=antigen">antigen</a> exposure. Differentiation dramatically changes a cell's size, shape, <a href="page.php?w=membrane_potential">membrane potential</a>, <a href="page.php?w=metabolism">metabolic activity</a>, and responsiveness to signals.</p><p>
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