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how to solve this problem about PCR ( no band or faint band )?? 1- PCR...

how to solve this problem about PCR ( no band or faint band )??
1- PCR product has high GC content .
2-Primers were designed or synthesized incorrectly .
3-Extension time was too short.
4-Incorrect annealing temperature.
5-Denaturation temperature was too low.
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Q. how to solve this problem about PCR ( no band or faint band )??

3-Extension time was too short.

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