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LETTERS
The burden of proof: A response to Rosi-Marshall et al.
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*Donald Danforth Plant Science Center, 975 North Warson Road, St. Louis, MO 63132; Science and Technology Adviser to the Secretary of State, U.S. Department of State, Washington, DC 20520; Willaman Professor of Life Sciences and Evan Pugh Professor, Pennsylvania State University (on leave), University Park, PA 16802; ¶Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, CA 90024; and ||College of Natural and Agricultural Sciences, University of California, Riverside, CA 92521
To the Editor: A recent paper in PNAS (1) purports to show that insect-resistant crops have unexpected effects on nontarget insects in streams. A sentence in the Abstract reads "Stream insects are important prey for aquatic and riparian predators, and widespread planting of Bt crops has unexpected ecosystem-scale consequences." The data presented in the paper
To whom correspondence should be addressed. E-mail: rnbeachy@danforthcenter.org
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