I have 10 products + 1 neg. control ,
You may wrongly loaded on gel? it happens. or mis-pipetting while making the reaction also possible. If you still need the answer just re do it carefully with only 2-3sample with your negative control.
I agree with Dr. Ananda. Did the PCR product of your "negative control"give the expected size? Or otherwise is a non-specific DNA product?
What were you using as a negative control??
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