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NMR characterization of J9a four-way junction 37. (A) Exchange process between the A/D and the A/B coaxial stacked forms with the 8-13C-guanosines labels G14 and G15 highlighted in orange. (B) Imino proton NMR spectrum of 37 in the absence and presence of 20 eq. MgCl2. (C) 1H-13C-HSQC spectra of 37 (G14, G15 labeled) and 38 (G14 labeled) with assignments.
