Encoded by the TCR Valpha24-Jalpha18 germline configuration, Valpha24-JalphaQ is expressed on a subset of NKT cells, namely invariant NKT (iNKT). Valpha24-JalphaQ TCR interacts with the glycolipid loaded MHC class 1b molecule CD1d, inducing activation and subsequent cytokine production. iNKT cells have been implicated in immune regulation, tumor surveillance, and host response to pathogens. While iNKT cells occur at low frequency in the blood, assorted chemokines contribute to their tissue homing potential.