U2 auxiliary factor (U2AF), comprised of a large and a small subunit, is a non-snRNP protein required for the binding of U2 snRNP to the pre-mRNA branch site. U2AF2 is the U2AF large subunit which contains a sequence-specific RNA-binding region with 3 RNA recognition motifs and an Arg/Ser-rich domain necessary for splicing. The large subunit binds to the polypyrimidine tract of introns early during spliceosome assembly. Synonyms: Polyclonal U2AF2 antibody, Anti-U2AF2 antibody, U2 small nuclear RNA auxiliary factor 2 antibody, U2AF65 antibody.