Anti-interferon alpha 21 antibodies are used for the immunodetection of the protein encoded by the IFNA21 gene. In humans, the canonical protein has a reported length of 189 amino acid residues and a mass of 21.7 kDa. It is known to be a secreted protein. A member of the Alpha/beta interferon protein family, it is known to be involved with adaptive immune responses and B cell differentiation. Other names for this target antigen include LeIF F, leIF-F, IFN-alpha-21, interferon alpha-F, leukocyte interferon protein, and IFN-alphaI. Gene orthologs have been identified in the mouse, rat and chimpanzee species. Over 60 citations in the literature describe the use of interferon alpha 21 antibodies in research. Western Blot is a widely used application for these antibodies. In addition, ELISA is also a common application.