A polyclonal antiserum raised against UV-irradiated DNA can be used to assay cyclobutane pyrimidine dimers and Pyr(6-4)Pyo photoproducts specifically by changing the nature of the 32P-labelled antigen. Pyr(6-4)Pyo photoproducts were removed faster than cyclobutane dimers in UV-irradiated human, hamster and mouse cells. Xeroderma pigmentosum cells from complementation groups A, C and D were deficient in the repair of both lesions.
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