Provided below are ELISA kits targeting U2 snRNP associated SURP domain containing, a human protein encoded by U2SURP. This protein is 1029 amino acids long, with a mass of 118.3 kDa, and is a member of the Splicing factor SR family. 3 isoforms have been identified. This is reported to be a nuclear protein. Other alias names for this protein include: U2 snRNP-associated SURP motif-containing protein, 140 kDa Ser/Arg-rich domain protein, Ser/Arg-rich domain protein 140 kDa, U2-associated SR140 protein, functional spliceosome-associated protein a, SR140, and fSAPa.