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United States Department of Agriculture

Agricultural Research Service

Image Number D1821-3

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Image Number D1821-3

For a study assessing the contribution of skin pigmentation, sun exposure, and diet to vitamin D status, graduate student Melissa Zerofsky uses a reflectance spectrophotometer to measure a volunteer’s skin pigmentation at the ARS Western Human Nutrition Research Center in Davis, California.

Photo by Peggy Greb.


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Last Modified: 6/29/2010
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