Gel retardation assay using RNA with a complementary Morpholino

This image is of a gel retardation assay using RNA with a complementary Morpholino altering its migration.

https://static-content.springer.com/esm/art%3A10.1007%2Fs00705-017-3666-...

This is from the paper:
Phumesin P, Junking M, Panya A, Yongpitakwattana P, Noisakran S, Limjindaporn T, Yenchitsomanus P. Vivo-morpholino oligomers strongly inhibit dengue virus replication and production. Arch Virol. 2017;[Epub ahead of print] doi:10.1007/s00705-017-3666-9
https://link.springer.com/article/10.1007/s00705-017-3666-9