IL5 and Increased total eosinophil count: Adoptive transfer experiments with cells isolated from homozygous Red5 mice (Il5−/− mice), instead of Il5+/+ mice (Fig. 9 A), revealed that the effects of ILC2s exhibiting the ILC9 phenotype on airway eosinophilia were entirely dependent on their own production of IL-5 (Fig. 9, F and G).