FCAR, also known as Fc alpha RI or CD89, is a 50-100 kDa glycosylated bone marrow-specific type I transmembrane (TM) Fc receptor, which is a member of the immunoglobulin gene superfamily. FCAR exists on the surface of myeloid cells such as neutrophils, monocytes, macrophages and eosinophils, and mediates the immune response to pathogens. It interacts with IgA-regulated targets and triggers a variety of immune defense processes, including phagocytosis, antibody-dependent cell-mediated cytotoxicity and stimulating the release of inflammatory mediators. This product is made by recombinant expression of human FCAR from HEK293 cell line, purified, sterilized, filtered, packaged and freeze-dried.