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U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) entomologist Jay Evans and postdoctoral research associate Ryan Schwarz use a microscope to look at spores of the honey bee fungal parasite Nosema ceranae, which can replicate in cells lining the honey bee gut on Oct. 25, 2011. Photo by Stephen Ausmus.

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Taken on October 25, 2011