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Pollutants that mimic natural hormones have created a "toxic stew" in the Potomac River, altering the sexual development and the immune systems of fish, a local nonprofit group warned in a report Wednesday.
The report says it appears that chemicals -- it's still not certain which ones -- in the water are interfering with the hormones that guide development in the fish. It said that potential causes include animal hormones from manure washing off farm fields in the rain and human hormones and pharmaceuticals that are flushed out with treated sewage.
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