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Induction of Id3 and bax mRNA and protein is dependent on ROS. HaCaT (a, b) or E6/7 (c, d) immortalized keratinocytes were exposed to UVB in presence or absence of SOD. After the indicated times RNA or protein was extracted and subjected to RTPCR or immunoblot analysis using primers or antibodies specific for Id3, bax, or GAPDH.
