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University of Guadalajara

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Maria Dolores León Torres (left), at home with her family in the La Vista neighborhood of Chapala, Mexico. She and her son Juan de Dios, age 4 (center), were part of a Harvard study investigating suspected contamination in fish from Lake Chapala. “We haven’t ever gotten ill,” she said. Photos by Ned Brown/Harvard Staff

The mystery of the lake

Harvard researchers probed whether fish in Mexican area were contaminated — and were harming mothers, children

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