Amplification of 200-1000-bp DNA fragments was performed in 15-30 min using a rapid thermal cycler based on the commercial instrument TC-1000-1 (IRLEN, St. Petersburg, Russia). Plastic pipette tips were used as thin walled, high surface to volume-ratio tubes, to increase the rate of heating (cooling) of 20 microliters samples, which allowed the time required for DNA amplification to be considerably reduced (5-10 times).
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