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(a) First examples of end-of-DNA modification with porphyrinoids to create artificial sequence specific nucleases.25,26 (b) Structure (left) and schematic (middle) of porphyrins acting as caps (red and blue bars) for the blunt end of DNA; modeled DNA structure and induced Soret-band CD spectra of the porphyrins (right), showing DNA structure dependent exciton coupling. Reproduced from ref (28) with permission from the Royal Society of Chemistry.
