U11 snRNP cellular_component snRNP U11 12S U11 snRNP A ribonucleoprotein complex that contains small nuclear RNA U11, a heptameric ring of Sm proteins, as well as several proteins that are unique to the U11 snRNP, most of which remain associated with the U11 snRNA both while the U11 snRNP is free or assembled into a series of spliceosomal complexes. GO:0005692 spliceosomal snRNP complex