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Free Picture: Hair Specimen
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Description Peggy Greb photograph of chemist Chris Hawkes preparing 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.
Keywords ars, caucasian, caucasian man, caucasians, chemist, chemists, chris hawkes, dept of agriculture, hair, hair specimen, man, men, one man, one person, people, person, research, selenium content, specimen, us department of agriculture, department of agriculture, free photography, free photo, free photos, free picture, free pictures, free image, free images
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