Fig. 4. Infiltration of eosinophils in the nasal mucosa. (A) Chromotrophe 2R staining of the nasal mucosa in each group. Level of eosinophil infiltration (red color) markedly decreased in OVA+TSA group compared with OVA group. (B) Eosinophil counts in the nasal mucosa. Eosinophil count was significantly reduced in OVA+TSA group compared with OVA group (×400). OVA, ovalbumin; TSA, trichostatin A. ^*P<0.05 compared to control. ^†P<0.05 compared to OVA.