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United States Department of Agriculture

Agricultural Research Service

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Image Number K9825-1

As part of a study on selenium's effects, phlebotomist Evelyn Holguin draws a blood sample from a volunteer. Study participants provide samples about every 6 weeks for biochemical, genetic, and immunological analysis.

Photo by Peggy Greb.

640 pixels wide: (k9825-1.jpg)

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Last Modified: 8/13/2016
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