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The frustule, or cell wall, of a Cymbella diatom -- Courtesy of Nikon Small WorldThis 200x image shows the frustule, or cell wall, of a Cymbella diatom. Honored as an Image of Distinction in the 2012 Nikon Small World Photomicrophotography Competition, it was taken by Piotr Rotkiewicz ofpirx.com in Arlington, MA, using differential interference contrast.

www.nikonsmallworld.com

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