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A, Schematic of treatment strategy of tadpoles. B, Survival curve of tadpoles exposed for 3 weeks to 0.2% ethanol (vehicle control) or 0.1, 1, 5, or 10 μg/l of an equimass mixture of 23 UOG chemicals. Survival was monitored for 20 days following exposure during which tadpoles were checked daily. The data are pools of 2 independent experiments. **p < .005 (Log Rank Test).
