KLRK1 and neoplasm: Though the Vγ9Vδ2 TCRs derived from different T cell clones show varying anti-tumor responses, linked to small differences in the γ9 and δ2 CDR3 regions; no correlation was found between the expression of NKG2D, CD158a, NKAT-2, or NKB-1 and anti-tumor reactivity (81).