Immunoglobulin-like receptor which plays an inhibitory role in degranulation of mast cells. Negatively regulates IgE-mediated mast cell activation and suppresses the type I immediate hypersensitivity reaction (By similarity). Monomer. Interacts (tyrosine-phosphorylated) with PTPN6, PTPN11 and INPP5D. Expressed in myeloid cells (dendritic cells, macrophages and neutrophils, weak expression on B-cells but not in T-cells or natural killer cells), peripheral blood basophils and mast cells (at protein level). N-glycosylated. Truncated N-terminus. Extended N-terminus.