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<p>reactivation, the first <a href="page.php?w=DNA_repair">DNA repair</a> mechanism to be discovered, was described initially by Albert Kelner in 1949 and independently by Renato Dulbecco also in 1949.</p>

<p><big> Function </big></p>
<p>Photolyases bind complementary <a href="page.php?w=DNA">DNA</a> strands and break certain types of <a href="page.php?w=pyrimidine_dimer">pyrimidine dimer</a>s that arise when a pair of <a href="page.php?w=thymine">thymine</a> or <a href="page.php?w=cytosine">cytosine</a> bases on the same strand of DNA become <a href="page.php?w=covalent_bond">covalently</a></p><p>
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