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Expression of cytochrome P4501A (CYP1A) has been used as a biomarker for possible exposure to contaminants such as PCBs and dioxins in teleost fish. Using a quantitative reverse transcription-polymerase chain reaction (Q-RT-PCR) and a non-lethal gill biopsy, we estimated levels of CYP1A mRNA expression in Atlantic salmon (Salmo salar). Groups of ten Atlantic salmon juveniles (48 -76 g) received an intraperitoneal injection of 50 Ag g À 1 h-naphthoflavone (BNF) or vehicle. Their gill tissuesdoi:10.1016/j.cca.2005.04.010 pmid:16051526 fatcat:ubjkya2qhzcnlmrknnzkv77csu