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The characterization of residual structures persistent in unfolded proteins in concentrated denaturant solution is currently an important issue in studies of protein folding because the residual structure present, if any, in the unfolded state may form a folding initiation site and guide the subsequent folding reactions. Here, we studied the hydrogen/deuterium (H/D)-exchange behavior of unfolded human ubiquitin in 6 M guanidinium chloride. We employed a dimethylsulfoxide (DMSO)-quenched H/D-exchange NMR technique with the use of spin de