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Bronchiolar epithelium of 109 week old untreated rat. H&E (a) and calretinin (Cal) (b), Wilms tumor protein (WT‐1) (c), podoplanin (d) and thyroid transcription factor‐1 (TTF‐1) (e) staining. The cytoplasm is slightly stained by Cal and WT‐1. Nuclei are clearly positive for TTF‐1.
