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2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is one of the most potent ligands of the aryl hydrocarbon receptor (AhR). Here, we show that a novel fused mesoionic heterocyclic compound (AZ1) is ∼5-fold more potent than TCDD in both rat and human cell lines at inducing cytochrome P4501A1 RNA. In rat H4IIE cells, AZ1 gave an EC 50 =5.05pM (95% CI=2.81–9.09pM) whereas TCDD had an EC 50 =25...
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