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<p>In the first step of PCR, the two strands of the DNA double helix are physically separated at a high temperature in a process called <a href="page.php?w=Denaturation_%28biochemistry%29">nucleic acid denaturation</a>. In the second step, the temperature is lowered and the primers bind to the complementary sequences of DNA. The two DNA strands then become <a href="page.php?w=DNA">templates</a> for DNA polymerase to <a href="page.php?w=enzyme">enzymatically</a> assemble a new DNA strand from free <a href="page.php?w=nucleotide">nucleotide</a>s,</p><p>
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