SLAMF6 and neoplasm: Using proliferation dye staining and either flow cytometry or imaging, we failed to detect residual dye signal among the adoptively transferred antigen-specific OT-I cells in the tdLN of tumour-bearing mice (Extended Data Fig. 1b–f), indicating that these clustering TCF-1+PD-1+SLAMF6+ cells at day 8 represented a subset of activated and extensively divided OT-I cells.