Why do I see "arms" in the resulting bands from this denaturing polyacrylamide electrophoresis (Urea-PAGE)?

I run this denaturing PAGE in a 20% polyacrylamide gel (8M urea), using 1x TBE as running buffer. All samples (5 ul), including ladder, were treated with 5 ul formamide at 95ºC for 5 min and then...

29 January 2019 1,757 0 View