Similar to Il33−/− mice, Il25−/− mice and Crlf2−/− mice showed attenuated airway eosinophilia after FAP inhalation, suggesting that IL-25 and TSLP, in addition to IL-33, are involved in FAP-induced airway eosinophilia. The gene discussed is CRLF2; the disease is Increased total eosinophil count.