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Time course of cytokine secretion after UVB irradiation from HCEC cells. ELISA determination of IL-6 and IL-8 in the supernatant of human corneal epithelial cells following UVB irradiation at the marked time points. Data are expressed as mean ± SD of three independent determinations. ***, **** mark significant (p < 0.001, 0.0001, respectively) changes compared to the relevant time-matched control group.
