This is a screenshot of the sequencing results. The letters in the quality line are all F and almost all samples are like this！Is it normal? Why dose this happen?
Actually, I see other scores in there, as well: F, ,, :!
Maybe? Its hard to say without know what sequencing technology you used, preprocessing steps applied, etc. I think if you want a concrete answer, you should check with your sequencing center - they should be able to tell you more about these data.
