CD160 is a glycosylphosphatidylinositol-anchored Ig domain protein that is expressed on almost all intestinal intraepithelial lymphocytes (IELs) T (gamma delta T) cells NK (natural killer) cells and a minor subset of CD4 and CD8 T cells In terms of function work has centered on the role of CD160 in enhancing NK or CD8 T cell activation Such effects have been attributed to the ability of CD160 to bind classical and nonclassical MHC class I molecules although with apparent low affinity requiring clustering of MHC class I molecules or overexpression of CD160 or MHC class I for detection of the interaction