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What is the duration (Life") of pfu turbo DNA polymerase AD. I am trying o Amplification a 3.3kb fragment and the PCR schedule is 6 hours long. The manufacturers notes just specify that its activity remains 94-99% in 1 hour at 95, nothing more.

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I don't know the exact half-life of this special Pfu polymerase, but generally Pfu polymerases are pretty stable. This source gives a half life of 18-25 hours at 95°C, meaning you keep the enzyme at 95°C for the whole time a you still have 50% activity after that time. Since you don't do that, I wouldn't worry too much about the activity. To be safe, you can add an extra long (probably 10-15 minutes) single amplification step before cooling down.

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