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(A) Schematic representation of oligonucleotide spin labeling. [PS]—Phosphorothioate group. (B) Sequences of oligonucleotides. (C) Schematic representation of NA complexes with a short linker (T0, T1, T3) in one chain and a T3 linker with nitroxide. The spin labels are marked as a red star (*). (D) Schematic representation of flexible complexes with long linkers (T7, T10, T25).
