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United States Department of Agriculture

Agricultural Research Service

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Image Number D2919-1

Research leader Pina Fratamico (right) and retired chemist Marjorie Medina perform an assay on a sample from an agar medium presumed to contain STEC bacteria.


Photo by Peggy Greb.

640 pixels wide: (d2919-1.jpg)

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Last Modified: 8/13/2016
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