ULBP6/RAET1L, is a polymorphic locus that expresses a functional transcript. ULBP6 had a more restricted expression profile in cell lines and primary human tissues than other NKG2D ligands, but expression was detected in several human papillomavirus-positive cervical carcinoma cell lines and was inducible on infection with human CMV. Expression of ULBP6 on target cells induced a significant increase in NK-cell killing. ULBP-6 Protein, Human, Recombinant (hFc) is expressed in HEK293 mammalian cells with hFc tag. The predicted molecular weight is 48.5 kDa and the accession number is AAK91503.1.

ULBP2 expression was however linked to expression of mature CD57() NK cells. In particular, expression of ULBP2 was strongest on those NK cells that had evidence of recent activation and proliferation. We suggest that ULBP2 could be used to identify recently activated mature NK cells.

ULBP6/RAET1L, is a polymorphic locus that expresses a functional transcript. ULBP6 had a more restricted expression profile in cell lines and primary human tissues than other NKG2D ligands, but expression was detected in several human papillomavirus-positive cervical carcinoma cell lines and was inducible on infection with human CMV. Expression of ULBP6 on target cells induced a significant increase in NK-cell killing. ULBP-6 Protein, Human, Recombinant (His) is expressed in HEK293 mammalian cells with His tag. The predicted molecular weight is 23.2 kDa and the accession number is AAK91503.1.

ULBP6/RAET1L (UL16-binding protein, also known as retinoic acid early transcript), is expressed as a full-lengthtranscript in cells and encodes a protein that is a ligand for bothNKG2D and the UL16 protein of HCMV.

ULBPs activate multiple signaling pathways in primary NK cells, resulting in the production of cytokines and chemokines. Binding of ULBPs ligands to NKG2D induces calcium mobilization and activation of the JAK2, STAT5, ERK and PI3K kinase/Akt signal transduction pathway, mediating natural killer cell cytotoxicity.