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Primary cultures of rat epidermal keratinocytes lose the ability to respond to chemicals with the induction of CYP1A1 gene expression after approximately 15 passages. This repression is mediated by a CT-rich direct repeat negative regulatory DNA (NeRD) element present in the upstream regulatory region of the CYP1A1 gene. Competitive gel retardation analysis using keratinocyte nuclear extracts and...
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