Hello everybody!
I have a question for you.
Do you ever seen a ladder (RNA 6000 nano) like this? What can be the causes?
I have prepared a fresh gel-dye mix and the electrodes of the instrument have been cleaned last week, no other analysis was made in this period.
The gel matrix, the RNA dye concentrate solution and the ladder are expired two months ago, it can be this the problem?

Thanks in advance