in fact, i haven't solve this question yet, i want to do northern-blot, your suggestion maybe work, i will try it, thanks!
the big problem of AS is how to study the function, especially the different function to wild type gene, do you have any good idea?
How do you optimize your PCR condition? I have met the same thing. I use KOD to amplify my target gene. I only got the small fragment. Later I increased the denature and primer annealing time (from 20s to 25s). Interestingly, the bigger band appeared.
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