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Retina of a Painted Turtle -- Courtesy of Nikon Small WorldThis 400x image of the retina of a painted turtle (Chrysemys picta) won second place in the 2013 Nikon Small World Photomicrophotography Competition. It was taken by Dr. Joseph Corbo of Washington University School of Medicine in St. Louis, MO, using differential interference contrast.

www.nikonsmallworld.com

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