Inhibitory receptor postulated to negatively regulate immune and non-immune functions (By similarity). Upon phosphorylation, recruits SH2 domain-containing PTPN6 and PTPN11 phosphatases to its ITIM motif and antagonizes activation signals (By similarity). Although it inhibits KLRK1/NKG2D-mediated signaling, it does not bind known ligands of KLRK1/NKG2D and therefore is not its inhibitory counterpart (By similarity). May limit activation of myeloid cell subsets in response to infection or tissue inflammation (By similarity). May protect target cells against natural killer cell-mediated lysis (By similarity). May negatively regulate cell cycle and differentiation of melanocytes via inactivation of STAT3 (By similarity). Homodimer. Interacts (via ITIM motif) with PTPN6. Interacts (via ITIM motif) with PTPN11; this interaction triggers dephosphorylation and activation of PTPN11. Contains 1 copy of a cytoplasmic motif that is referred to as the immunoreceptor tyrosine-based inhibitor motif (ITIM). This motif is involved in modulation of cellular responses. The phosphorylated ITIM motif can bind the SH2 domain of several SH2-containing phosphatases.