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Dehalogenation pathway for 24-25-BB and 25-25-BB. Both congeners were dehalogenated to 2-2-BB, which began to accumulate at 14 days and persisted for at least 16 weeks. Dehalogenation of 2-2-BB began sometime after 17 weeks and prior to 54 weeks. In both cases, small amounts of 2-2-BB and tetrabromobiphenyl still persisted at 54 weeks.
