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Stability, folding, and unfolding of the Src SH2 domain in 20 mM imidazole (pH 7.4). (A) Equilibrium unfolding in H2O (•) and D2O (○) detected by fluorescence. The location of the single tryptophan residue (W5) is shown in the inset. (B) Folding and unfolding rates plotted as a function of urea in H2O (•) and D2O (○). Fit parameters are listed in Table 1.
