Anti-U1A antibodies enable researchers to detect and measure the U1A antigen in biological samples. This target is a reported synonym of the SNRPA gene, which encodes small nuclear ribonucleoprotein polypeptide A. This protein is known to function in RNA splicing, among other biological roles. The human version of U1A has a canonical amino acid length of 282 residues and a protein mass of 31.3 kilodaltons. It is reported to be localized in the nucleus of cells and widely expressed in many tissue types. This target antigen may also be known as Mud1.