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