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<p>cell, including: the structure of the cell's <a href="page.php?w=Cell_surface_receptor">surface receptors</a>; the availability of <a href="page.php?w=transcription_factor">transcription factor</a>s that can identify pathogenic DNA or RNA; the ability of the cells and tissue to support viral or bacterial replication; and the presence of physical or chemical barriers within the cells and throughout the surrounding tissue.</p>

<p><big> Cell surface receptors </big></p>
<p>Pathogens frequently enter or adhere to host cells or tissues before causing infection.</p><p>
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