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May 22, 2013
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Definition of Psoralen

Psoralen: Any of a number of drugs and other substances containing chemicals that react with ultraviolet (UV) light to cause darkening of the skin.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=9866
Last Editorial Review: 6/14/2012

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