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Effect of PE fractions on UVB-induced PGE2 production in keratinocytes. After irradiation with 30 mJ/cm2 HaCaT cells were treated for 24 h with PE1, PE2, PE3 or PE4 that were obtained by Sephadex LH20 column separation. The concentration of PGE2 was measured in the cell culture supernatants. Data are expressed as mean ± SD of three independent experiments and the statistical significance was determined compared to the irradiated, untreated control (** p < 0.01).
