Table 1.

Summary of ILC2 phenotypes.

	Mouse					Human
	Lung	Intestine	Skin	Liver	Fat	Blood
CD127	+	+	+	+	+	+
CD90	+	+	+	+	+	−
CD25	+	+	+	+	+	+
CD103	ND	ND	+	ND	ND	−
IL-18Rα	−	−	+	−	−	+
ST2	+	low	+/low	+	+	−
IL-25R	low	+	+/low	ND	−	−
CRTH2*						+
CD161*						+
GATA3	+	+	+	+	+	+

“+”, expressed; “−”, not expressed; “low”, expressed at low levels; “+/low”, various reports exist; “ND”, not determined. *human ILC2 markers. Human ILC2 phenotype is based on peripheral blood ILC2s.