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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number K10364-1

Technician George Perry conducts a radioimmunoassay to measure progesterone concentration in serum samples from cows that ovulated different-sized follicles.

Photo by Peggy Greb.

640 pixels wide: (k10364-1.jpg)

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Last Modified: 5/23/2006
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