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<p>authors suggest.</p>

<p><big>Mechanism</big></p>
<p><a href="page.php?w=DNA">DNA</a> nucleotides are held together with <a href="page.php?w=DNA">hydrogen bonds</a>, which are relatively weak and can be easily broken. Base flipping occurs on a millisecond timescale by breaking the hydrogen bonds between bases and unstacking the base from its neighbors. The base is rotated out of the <a href="page.php?w=double_helix">double helix</a> by 180 degrees, typically via the <a href="page.php?w=Major_groove">major groove</a>, and into the active site of an enzyme.</p><p>
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