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PCBs are stubborn chemicals. They persist in soil and sediment for decades, perhaps centuries, and are locked away in the fatty tissues of animals, building up in food webs.

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Dirty Soil and Diabetes: Anniston's Toxic Legacy

For four decades, from 1929 until 1971, a Monsanto plant in West Anniston produced chemicals called PCBs, polychlorinated biphenyls.

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