Frogs: Clues to how weed killer may feminize males

Study turns up new perturbations in multiple hormone systems

By Janet Raloff, 19:48 PM March 2, 2010

Atrazine, a widely used agricultural herbicide, not only can alter hormone levels in developing frogs, but also perturb their physical development — and lead to an excess number of females, researchers report. Their new findings may help explain observations reported by a number of other research groups that at least in frogs, fairly low concentrations of atrazine can induce a feminization — or demasculinization.

Industry scientists have charged that lab studies with non-native frogs are po...

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