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Catch and release: Multivalent dendrons that have o-nitrobenzyl-linked spermine surface groups bind DNA efficiently by multivalent interactions. Cleavage of the o-nitrobenzyl groups from the dendron framework, with short UV irradiation, results in a rapid release of DNA, which can be attributed to dendron degradation and charge-switching multivalency (see picture).
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Kostiainen et al. (2007) studied this question.
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