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<p>The term <b>heterologous</b> has several meanings in biology.</p>

<p><big> Gene expression </big></p>
<p>In <a href="page.php?w=cell_biology">cell biology</a> and <a href="page.php?w=Protein_methods">protein biochemistry</a>, heterologous expression means that a protein is experimentally put into a cell that does not normally make (i.e., <a href="page.php?w=Gene_expression">express</a>) that protein.  Heterologous (meaning 'derived from a different organism') refers to the fact that often the transferred protein was initially cloned from or derived from</p><p>
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