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UV-induced thymine dimeric lesions within DNA. (A) Chemical structure of the photoproducts involving adjacent bases. The stereochemistry of the spore photoproduct formed within DNA has not yet been determined. (B) Schematic representation of the different isomers of the thymidine cyclobutane dimer. dR, 2-deoxyribose. cis,syn and trans,anti cyclobutane dimers are meso forms and thus exist as a single isomer.
