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A, B: Cheek mucosa of the untreated animals 1d (A) and 1 week (B) after the beginning of the experiments in the experimental groups. Mice cheek mucosa shows in contrast to human cheek mucosa slight keratinization. C, E: Cheek mucosa 1 day after UV-treatment with no alterations of the mucosa (C 8 s, E 48 s). D, F: Unaltered cheek mucosa one week after the UV-treatment (D 8 s, F 48 s). (A-F: HE, original magnification 200-fold).
