Hello. I'm running total cell protein samples in a 4-20% Mini-Protean TGX gels. The center of each lane/sample contains a vertical streak/line. Is this from interference of genomic DNA? I was able to decrease the amount of genomic DNA in my samples (so they had no issues when using a pipettte), which decreased the intensity of the line but did not remove it. It is not a huge issue for me but one I would like to understand better and thought someone on this forum would likely know the answer.