I am working on the cross-link of RNA and protein. I have seen many people use SDS-PAGE to separate these RNA-protein complexes in publications, but I am also wondering if I can also run TBE-Urea gel to see the band shifts. I just need to see the band for RNA and RNA-protein crosslink products. I am working on short RNAs, about 20 nt. And protein is about 40-50 kDa.