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Irradiation of alkane-linked DNA hairpins possessing TTT steps with flanking purine bases yields products identified as the cis-syn (2 + 2) dimers formed between the central thymine and its 3'- and 5'-neighbors. Selective formation of the 3'-dimer is attributed to ground state conformational effects and electron transfer quenching by purine bases.


Prakash P Neelakandan, Zhengzheng Pan, Mahesh Hariharan, Frederick D Lewis. Facially-selective thymine-thymine photodimerization in TTT triads. Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology. 2012 Jun;11(6):889-92

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PMID: 22580641

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