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The bands less than 100bp in size were primer dimers or RNA contaminations. When you extract DNA, treat the pellets with TE containing RNaseA at 37 degrees Celsius for 1 hour. When you amplify the target genes, use less primers and higher annealing temperature. By the way, set the positive and negetive controls on every experiment, which is  really helpful to find out the carrier.

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The bands less than 100bp in size were primer dimers or RNA contaminations. When you extract DNA, treat the pellets with TE containing RNaseA at 37 degrees Celsius for 1 hour. When you amplify the ta ...

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