Taq ConcentrationIn a PCR experiment approximately 1 unit of the Taq enzyme should be used for a 25μl reaction. Suboptimal concentration of the Taq enzyme can cause incomplete primer elongation or premature termination of the PCR product synthesis during the elongation step of a PCR cycle.
Too much Taq will result in an excessive background of unwanted DNA fragments (a smear on a gel) while a huge excess may cause the reaction to fail with no product being detected. A Taq concentration of 1 unit per 25μl reaction ensures a cleaner product and lower background.
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