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(a) Structures of studied spin-labeled dsDNAs I–III and TAM radical. Molecular frame (x,y,z) of TAM radical, where gz is parallel to the z axis, which is the threefold (C3) rotation symmetry axis of unlinked TAM. (b) Sketch of TAM-labeled dsDNA and corresponding theoretical model. Red and green solid arrows indicate z axes of TAM frame, θ is the angle between the z axes and the spin-spin direction AB, and ϕ is the torsion angle around the spin-spin axis AB.
