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. 2020 May 27;14:344–351. doi: 10.1016/j.reth.2020.04.002

Fig. 6.

Fig. 6

MTT assay of lower cell layers 3 days after incubation. (a) Macroscopic images of cells with or without UV irradiation. (b) (〇) 222 nm and (●) 254 nm ∗, p < 0.05, significant difference between the two groups.