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Human TNF-α levels in WS1 fibroblasts receiving no irradiation (0 J/cm2) or irradiation (5 J/cm2) at 660 nm at (a) 0 h, (b) 24 h, and (c) 48 h postirradiation. Results are represented as the mean ± standard deviation. ∗P ≤ 0.05; ∗∗P ≤ 0.01; ∗∗∗P ≤ 0.001.
