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Transparent stretched films of DNA–dimethyldioctadecylammonium ion complex incorporating a photochromic diarylethene exhibited large change in optical rotation by its photochromic reactions. As the stretched films at the photostationary state of UV-irradiation showed the dichroism, it was suggested that the diarylethene molecules are partly intercalated between the DNA base pairs.
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Saitō et al. (2003) studied this question.
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