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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number D639-1

In tests to evaluate the effect of beneficial bacteria on the immune system, microbiologist Gloria Solano-Aguilar administers a probiotic treatment to a young pig.


Photo by Peggy Greb.

640 pixels wide: (d639-1.jpg)

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Last Modified: 10/31/2006
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