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MTT assay of cell sheets 3 days after incubation. The cells were irradiated at 5 or 10 mJ/cm2 of 222 or 254 nm UV light. (a) Macroscopic images of cells with or without UV irradiation. (b) Dose–response of MTT assay; (〇) 222 nm and (●) 254 nm ∗, p < 0.05, significant difference between the negative controls and the irradiated groups. †, p < 0.05, significant difference between 222 and 254 nm UV light irradiated groups at the corresponding dose.
