CD19 and neoplasm: Notably, similar antigen-specific IFNγ secretion was observed for both, the CXCR5 CAR-T as well as the CD19 CAR-T cells, although CD19 expression levels (Supplementary Fig. 7c) were on average 5–10-times higher than for CXCR5 (Fig. 1b) on all tumor cell lines.