SLAMF6 is a type I transmembrane protein, belonging to the CD2 subfamily of the immunoglobulin superfamily. SLAMF6 is expressed on Natural killer (NK), T, and B lymphocytes. It undergoes tyrosine phosphorylation and associates with the Src homology 2 domain-containing protein (SH2D1A) as well as with SH2 domain-containing phosphatases (SHPs). It may function as a coreceptor in the process of NK cell activation. It can also mediate inhibitory signals in NK cells from X-linked lymphoproliferative patients. It may play a role in the regulation of autoimmune diseases.