Anti-serine and arginine-rich splicing factor 3 antibodies are protein reagents that detect specific antigens. The serine and arginine-rich splicing factor 3 antigen is another term for the human protein serine and arginine rich splicing factor 3, encoded by the SRSF3 gene. The protein is reported to be a splicing factor that specifically promotes exon-inclusion during alternative splicing. Canonically, it has an amino acid length of 164 residues and a mass of 19.3 kilodaltons. Its subcellular localization is in the nucleus and cytoplasm and it is widely expressed in many tissue types. The serine and arginine-rich splicing factor 3 protein is a member of the Splicing factor SR protein family.