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<p>cells is largely specific to particular organs or tissues. Thus they are used clinically to identify the cell of origin of various human tumors.</p>

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<p>The term cytokeratin began to be used in the late 1970s, when the <a href="page.php?w=protein_subunit">protein subunit</a>s of keratin <a href="page.php?w=intermediate_filament">intermediate filament</a>s inside <a href="page.php?w=Cell_%28biology%29">cells</a> were first being identified and characterized. In 2006 a new systematic nomenclature for mammalian keratins was created,</p><p>
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