KLRG1 and eosinophilic esophagitis: KLRG1 was chosen as a comarker because of its high expression in normal esophageal ILC2s in mice (Fig. 1G) and upregulated KLRG1 expression in active EoE patients’ esophagus-resident ILC2s compared with that in esophageal Th2 cells [12].