
(fo″to-re-ak″tĭ-va´shәn) reversal of the biological effects of ultraviolet radiation on cells by subsequent exposure to visible light.
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: fō′tō-rē-ak′ti-vā′shŭn Definitions: 1. Activation by light of something or of some process previously inactive or inactivated; pyrimidine dimers, formed in polynucleic acids by the action of UV light, can be monomerized by UV light of a different wavelength through DNA photolyase....
Found on
http://www.medilexicon.com/medicaldictionary.php?t=68659
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