T cell immunoreceptor with Ig and ITIM domains (TIGIT) is an immune receptor present on some T cells and natural killer cells (NK). This protein could bind to CD155 (PVR) with high affinity, which causes increased secretion of IL-10 and decreased secretion of IL-12B and suppresses T-cell activation by promoting the generation of mature immunoregulatory dendritic cells. TIGIT could also bind to CD112 (PVRL2) with lower affinity. TIGIT's inhibition of NK cytotoxicity can be blocked by antibodies against its interaction with PVR and the activity is directed through its ITIM domain.

> 90% as determined by SDS-PAGE