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7-dehydrocholesterol

[ -dē-hī′drō-kə-lĕstə-rôl′, -rōl′ ]
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n.
A provitamin present in the skin of humans as well as the milk of mammals that becomes vitamin D3 when exposed to ultraviolet light.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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