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Jenna Ladd| July 11, 2017 In the largest study of its kind, UI researchers have detected polychlorinated biphenyls (PCBs) in six schools throughout the midwest. Polychlorinated biphenyls (PCBs) are a class of manmade organic chemicals that were heavily used in construction and industry from 1929 until they were banned in 1979. PCBs are now known to… ....

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