Dimethylthymine was photodimerized with ultraviolet radiation, and the structure of one of the resulting dimers, the cis 5,5 : 6,6 isomer, was determined by single-crystal x-ray diffraction. This isomer is the same as that obtained by ultraviolet irradiation of DNA; hence the structure of the thymine dimer in irradiated DNA is now proved.
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Camerman et al. (1968) studied this question.
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