Anti-IFNA21 antibodies are used in the immunodetection of the protein interferon alpha 21. In humans, the canonical protein has a reported length of 189 amino acid residues and a mass of 21.7 kDa. It has been described to be a secreted protein. A member of the Alpha/beta interferon protein family, IFNA21 is known to be involved with adaptive immune responses and B cell differentiation. Synonyms for this target antigen include LeIF F, leIF-F, IFN-alpha-21, interferon alpha-F, leukocyte interferon protein, and IFN-alphaI. IFNA21 gene orthologs have been reported in the mouse, rat and chimpanzee species. Over 60 citations in the literature describe the use of IFNA21 antibodies in research. These antibodies are most commonly used in Western Blot experiments, among other applications.