Fig. 3

Effects of testing samples on infiltration of inflammatory cells in the airway. a–d May-giemsa stain; bar = 20 μm. a WT ovalbumin (OVA) + heated-Asian sand dust (H-ASD) + lipopolysaccharide (LPS): moderate infiltration of eosinophils into the airway submucosa. b TLR2^−/− OVA + H-ASD + LPS: moderate infiltration of eosinophils. c TLR4^−/− OVA + H-ASD + LPS: slight infiltration of eosinophils. d MyD88^−/− OVA + H-ASD + LPS: no significant pathological changes in the airway submucosa. Arrows show eosinophils with red granules. Triangles show tissue macrophages