U2 snRNP Cleavage and Polyadenylation Complex Spliceosomal active C complex with lariat containing, 5'-end cleaved pre-mRNP:CBC complex Reactome DB_ID: 77505 Reactome Database ID Release 4377505 Reactome, http://www.reactome.org ReactomeREACT_5191 has a Stoichiometric coefficient of 1 lariat containing 5'-end cleaved mRNA:CBC complex pre-EJC complex U6 snRNP U5 snRNP RNA polymerase II (phosphorylated):TFIIF complex