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Reference.org
PER2
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<p>PER2 is a <a href="/facts/Protein/Jxmagu3E">protein</a> in mammals encoded by the <i>PER2</i> <a href="/facts/Gene/e1swwPY6">gene</a>. <i>PER2</i> is noted for its major role in circadian rhythms. </p>