Predicted to enable transmembrane signaling receptor activity. Predicted to be involved in cell surface receptor signaling pathway and immune response. Predicted to be located in membrane. Predicted to be active in external side of plasma membrane. Human ortholog(s) of this gene implicated in several diseases, including allergic disease (multiple); autoimmune disease (multiple); glomerulonephritis (multiple); graft-versus-host disease; and hematologic cancer (multiple). Orthologous to several human genes including FCER1A (Fc epsilon receptor Ia); FCGR3A (Fc gamma receptor IIIa); and FCGR3B (Fc gamma receptor IIIb).