I have harvested supernatant from HEK 293Ts (DMEM+10%FBS).
I have then passed them through a MWCO of 100 kDa.
Following this I have isolated RNA from both filtrate and unfiltered conditioned medium using Sigma Tri reagent.
I was trying to detect miRNA using a 15% urea-TBE gel.
I do not see any bands. Can anyone help?