Figure 7. Secretion of IL-6 cytokine induced by UV-B irradiation in HCE-T cells. Cells were irradiated with 30 mJ/cm² UV-B at 85%–90% confluency, and culture supernatants were harvested at the indicated time points. Control cells were treated in the same way but were not irradiated. The concentration of IL-6 cytokine was determined by ELISA.