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<p>that these DNA fragments were a specific degradation product of nuclear DNA.</p>

<p><big>Intentional</big></p>
<p>DNA fragmentation is often necessary prior to library construction or <a href="page.php?w=subcloning">subcloning</a> for DNA sequences. A variety of methods involving the mechanical breakage of DNA have been employed where DNA is fragmented by laboratory personnel. Such methods include sonication, needle shear, nebulisation, point-sink shearing and passage through a pressure cell.</p>

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* <a href="page.php?w=Restriction_digest">Restriction digest</a></p><p>
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