Immunogen sequence: DITEVPDFNK MYELYDPCTV MFFFRNKHIM IDLGTGNNNK INWAMEDKQE MVDIIETVYR G Antigen sequence identity: Mouse 100%; Rat 100%. Essential role in pre-mRNA splicing as component of the U5 snRNP and U4/U6-U5 tri-snRNP complexes that are involved i