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Interleukin‐33 (IL‐33) increased airways insulin‐like growth factor 1 (IGF‐1) expression. (a) Representative photomicrographs of IGF‐1 immunoreactivity in lung sections from saline‐ (NS), ovalbumin‐ (OVA) and IL‐33‐challenged mice at various time‐points as indicated (light microscopy, × 200). (b) Data are expressed as mean ± SEM (n = 5 mice in each group at each time‐point). *P < 0·05.
