NCAM1 and neuroblastoma: We have previously shown that expanded Vδ1+ cells retain innate killing of neuroblastoma cells,19 while Vδ2+ cells lose cytotoxicity during expansion.16, 19 In the current study, the innate cytotoxicity of the expanded cells following CD56 depletion was negligible against neuroblastoma (Vδ1 and Vδ2) (Figure 2) and low against SupT1 cells (Vδ2) (Figure S2).