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Effect of PPP on phosphorylation of p38 MAP kinase and JNK in HDF. The cells were pretreated with PPP at the indicated concentration for 1 h, irradiated with UVB at 25 mJ/cm2, and further incubated for 3 h. After incubation, the cells were lysed to determine the indicated protein expression. Statistical significance indicated ### p < 0.001 compared with the untreated group and *** p < 0.001 compared with the UVB-irradiated group.
