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Dose-dependent reduction in human keratinocyte viability induced by UV-B radiation. Keratinocytes were irradiated by UV-B (5, 10, 20, 50 mJ/cm2) and cell viability was determined by the MTT assay 1 to 48 hours after UV radiation. Data are expressed as mean ± SEM (n=4). Statistically significant differences (Student's t-test, p≤0.05) to the respective non-radiated control group incubated for 1 hour are marked with an asterisk.
