Tailed dots in 2D gel electrophoresis after CBB staining?

I have recently run IEF (7cm, PH 3-11, NL) and 2D gel electrophoresis (12.5%). After CBB staining, the dots were not shown as single dots. Most of them are tailed (see attached). I would guess...

26 March 2018 8,555 3 View