Haematoxylin and eosin (H&E) staining of the mice lung tissue. Knock-out aquaporin 5 (AQP5) reduced inflammation infiltration. (a) Wild-type (WT) mice, control; (b) AQP5−/− mice, control; (c) WT mice, asthma; (d) AQP5−/− mice, asthma (a, b, c, d: 400×). Representative H&E-stained sections are shown.