HepG2 cells were transiently transfected with Antioxidant Response Elements (ARE)-luciferase plasmid (Dr J. Alam, Department of Molecular Genetics, Ochsner Clinic Foundation, USA). Cells were lysed and assayed for luciferase activity by Dual-Luciferase® Reporter (DLR™) Assay System (Promega). pTK-Renilla was used as an internal control vector (Promega).
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