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United States Department of Agriculture

Agricultural Research Service

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Image Number K9823-1

Chemist Chris Hawkes prepares a hair specimen from a volunteer to analyze its selenium content. Hair can provide a history of dietary selenium intakes from a couple of weeks to many months in the past.

Photo by Peggy Greb.

640 pixels wide: (k9823-1.jpg)

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Last Modified: 5/23/2006
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