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A. Langerhans cells were seen to gather focally or in sheets around the terminal respiratory bronchioles to form granulomas. Histiocytes, and eosinophils were also visible (hematoxylin and eosin stain, original magnification ×200). B. Langerhans cells showed characteristics of an abundant cytoplasm, were weakly eosinophilic, nuclear groove and sag, and an obvious nucleolus (hematoxylin and eosin stain, original magnification ×400).
