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Imino proton regions of one-dimensional spectra of ψ9 + 10 and the 9-bp complementary duplex. Resonance assignments are labeled above the peaks. Traces A and B correspond to a one-dimensional spectrum with excitation sculpting water suppression (24) and a CLEANEX-PM spectrum (18), respectively, of the complementary duplex, and traces C and D are the equivalent spectra of the branch-site duplex.
