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?

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