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The immunohistochemical appearance of HNE in normal, healthy oropharyngeal mucosa. (A) No HNE can be seen in the normal epithelium of the healthy subject (indicated by asterisk), although adjacent stromal tissue contains HNE (indicated by arrows). (B) Prominent presence of HNE in non-malignant epithelium in the vicinity of squamous cell carcinoma grade III of the oropharynx.
