U1 snRNA
“Crystal structure at 1.92 A resolution of the RNA-binding domain of the U1A spliceosomal protein complexed with an RNA hairpin”. Nature 372 (6505): 432–8. (December 1994). doi:10.1038/372432a0. PMID 7984237.
“Two functionally distinct steps mediate high affinity binding of U1A protein to U1 hairpin II RNA”. The Journal of Biological Chemistry 276 (24): 21476–81. (June 2001). doi:10.1074/jbc.M101624200. PMID 11297556.