Background：FcepsilonRIa is a transmembrane protein belonging to the Ig superfamily. FcepsilonRIa forms a tetrameric complex with one b and two gamma-subunits. The FcepsilonRI complex plays an important role in triggering IgE-mediated allergic reactions. It is abundantly expressed on mast and basophils and up-regulated by the presence of IgE. Following stimulation via FcepsilonRIa, mast cells and basophils release bioactive chemical mediators such as histamine, resulting in the initiation of allergic reactions. Cross linking of the high-affinity receptor for IgE on tissue mast cells triggers immediate hypersensitivity with local symptoms. The MAR-1 monoclonal antibody reacts with the FcepsilonRIa subunit.
