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A smear in your PCR can be caused by too low annealing temperature. Too much or little magnesium or poor primer design or most likely poorly extracted DNA for your template. Precipitate your template DNA again with 70% ethanol give it a good dry and re-elute and try once more. You can also try diluting your template. If there are PCR inhibitors in your DNA prep then using less template can improve results. If you have plenty of DNA in your prep then a 10 or even 100 fold dilution shouldn't prevent good amplification.

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Q: What causes smear instead of a clear band in PCR?
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