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Caption: This is a close-up of the selection experiment. The different levels of damage inflicted by different aphid species compared to the no-aphid control (first cage on left) are clearly visible. This image relates to a paper that appeared in the Oct. 5, 2012, issue of Science, published by AAAS. The paper, by Tobias Züst at University of Zürich in Zürich, Switzerland, and colleagues was titled, "Natural Enemies Drive Geographic Variation in Plant Defenses."
Credit: Image courtesy of Tobias Züst
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