SELL and neoplasm: Upon stimulation with CD19+ tumor cells for 9 days, C-CAR-T central memory cells (Tcm, CD45RO+CD62L+ and effector memory cells (Tem, CD45RO+CD62L−) were 56.62% ± 11.97% and 40.48% ± 9.70%, respectively, among the C-CAR-T cells (Fig. 1B and Figs. S2B and S2).