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Hematoxylin and eosin (H&E)-stained histological sections of non-irradiated healthy (A–C, female; D–F, male), 6 years post-irradiated (G–I) and 6 months post-irradiated (J–L) head and neck cancer patients. H&E stain shows lymphocytic infiltration (red arrows) and disorganized ductal structures (yellow arrows). (A, D, G, J) Magnification 5×, bars = 400 µm; (B, E, H, K) magnification 10×, bars = 200 µm; (C, F, I, L) magnification 20×, bars = 100 µm.
