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To subscribe, E-mail the words . . The new Wisconsin studies support that view. The Wisconsin researchers, led by Dr. Richard E. Peterson, showed that dioxin interferes with the sexual development of male rats exposed to dioxin before, and shortly after, birth. The young males are demasculinized and feminized by doses of dioxin too low to cause any measurable toxicity in the mother rat. The sexual changes in the young males are both physiological and behavioral, and last into adulthood.