KLRG1 and neoplasm: We found that in the tumor tissues of tumor-bearing mice, nILC2s (ST+KLRG1− ILC2s), iILC2s (ST2−KLRG1+ ILC2s), and mILC2s (ST2+KLRG1+ ILC2s) were almost undetectable and most of the ILC2s were in a quiescent state (Fig. 2A, B).