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Pulmonary histology of different rat groups (hematoxylin-eosin [HE] staining, original magnification ×400). Evaluation of sub-epithelial and intra-luminal IgA accumulation in small airway of different rat groups. In lung tissue, with the aggravation of lung damage, less IgA accumulated in intra-luminal area, while more in sub-epithelial areas (immunohistochemical [IHC] staining, original magnification ×400). IgA: Immunoglobulin A.
