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Effects of various concentrations of RA on the levels of CPD and 8-OHdG in UVB-exposed HaCaT cells. Cells exposed to 700 J/m2 UVB were post-incubated in growth medium or medium containing various concentrations of RA for 24 h. The levels of CPD and 8-OHdG were determined by immunodot blot assay. Data shown represent the mean values of three independent experiments ± SD. *p < 0.05 and **p < 0.01 versus untreated UVB-exposed group (0 RA).
