The protein encoded by this gene is a type I transmembrane protein, belonging to the CD2 subfamily of the immunoglobulin superfamily. This encoded protein 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 functions as a coreceptor in the process of NK cell activation. It can also mediate inhibitory signals in NK cells from X-linked lymphoproliferative patients. Alternative splicing results in multiple transcript variants encoding distinct isoforms.[provided by RefSeq, May 2010],
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Function:
Function:Triggers cytolytic activity only in natural killer cells (NK) expressing high surface densities of natural cytotoxicity receptors.,PTM:Phosphorylated.,similarity:Contains 1 Ig-like (immunoglobulin-like) domain.,subunit:Homodimer. Interacts with PTN6 and, upon phosphorylation, with PTN11 and SH2D1A/SAP.,tissue specificity:Expressed by all (resting and activated) natural killer cells (NK), T- and B-lymphocytes.,
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Cellular Localization:
Cell membrane ; Single-pass type I membrane protein .
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Tissue Expression:
Expressed by all (resting and activated) natural killer cells (NK), T- and B-lymphocytes (PubMed:11489943). Increased surface expression on T-cells of systemic lupus erythematosus (SLE) patients (PubMed:22184727).