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H/D exchange data obtained for human ubiquitin at pH 11.95 by using SOFAST real-time 2D NMR. (Upper) The measured exchange rates are color-coded on the ubiquitin structure. (Lower) Examples of exchange curves corresponding to different exchange regimes together with the fitted exchange time constants. For residues color-coded in white, no signal decay was observed because the cross-peak intensity has decreased to its plateau value during the dead time of the experiment.
