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A lesion-specific enzyme-induced DNA strand break assay was developed for an oligonucleotide chip for the determination of UVB-induced cyclobutane pyrimidine dimers (CPDs). A 20-mer of fluorophore-labeled and biotinylated oligonucleotide was immobilized on the chip. CPDs in DNA on the chip were formed by UVB irradiation (312 nm). T4 endonuclease V (T4N5) was used to excise the CPD site as T4N5 sensitively...
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