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. Mast cell-specific. Expressed in primary and transformed mast cells. Up-regulated in response to mast cell activation. N-glycosylated. Extended N-terminus.