Anti-SSA1 antibodies enable researchers to detect and measure the SSA1 antigen in biological samples. This target is a reported synonym of the TRIM21 gene, which encodes tripartite motif containing 21. This protein is known to function in the cell cycle and innate immune responses, among other biological roles. The human version of SSA1 has a canonical amino acid length of 475 residues and a protein mass of 54.2 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the nucleus, cytoplasmic vesicles, and cytoplasm of cells and widely expressed in many tissue types. Other names for this target antigen include RNF81, RO52, and Ro/SSA. Western Blot is the most common application for the SSA1 antibodies listed below. ELISA and Immunohistochemistry are also common applications.