22.4 The spliceosome Domain D UC contains SnRNas sm binding Domain C Figure 22. 8UI A snrna has a base CG paired structure Domain B that creates several ACcU domains.The5￠ GGAUG GCI CCUAU CGG GGGACOUGC UU GACGGUCCAU UCA UApppGme evon GUAA GUA itron end remains single stranded and can Intron pairing base pair with the 5￠ splicing site Gc&c 消当 Domain AFigure 22.8 U1 snRNA has a base paired structure that creates several domains. The 5￠ end remains single stranded and can base pair with the 5￠ splicing site. 22.4 The spliceosome contains snRNAs