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Increased expression of CYP1A1 mRNA triggered by 5-aza-2'-deoxycytidine (5-Aza-dC). HeLa cells were either left untreated or treated with 5-Aza-dC for seven days, and subsequently treated with 3 µM PCB 126 for 4 or 6 h. qRT-PCR was used to assess CYP1A1 mRNA expression with normalization to RPLP0 mRNA. * p < 0.05 vs. control; # no drug treatment vs. 5-Aza-dC treatment; Error bars = SEM; n = 3.
