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United States Department of Agriculture

Agricultural Research Service

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Image Number D2801-1

Postdoctoral researcher Megan Witbracht (left) instructs a study volunteer (right) on an end-of-study test of brain function while chemist Nancy Keim answers questions that come up.


Photo by Peggy Greb.

640 pixels wide: (d2801-1.jpg)

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Last Modified: 8/13/2016
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