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Exposure of DNA to ultraviolet radiation results in the formation of a number of photoproducts, including thymine photodimers. A sensitive and selective analytical method based on high-performance liquid chromatography (HPLC) and fluorescent labeling with 4-bromomethyl-7-methoxycoumarin has been developed to quantify both thymine and thymine photodimers. The identity of the thymine and thymine dimer...