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The porphyrin chromophore incorporated at the 5′-position of an oligonucleotide allows the simultaneous detection of the B- to Z-DNA transition via the porphyrin Soret band circular dichroism exciton couplet signal around 420 nm and the oligonucleotide CD region below 300 nm, at micromolar concentrations.

Graphical abstract: Porphyrins conjugated to DNA as CD reporters of the salt-induced B to Z-DNA transition,

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