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Urea-induced unfolding experiments demonstrate that the probe does not significantly modify the stability of the protein. Urea-induced unfolding experiments were conducted by monitoring the CD signal at 222 nm. (A) Wild-type CTL9 and (B) metal carbonyl-labeled CTL9. The solid lines are the best fit to eq 2. Protein samples were in 10 mM MOPS, 150 mM NaCl at pH 7.0 at 25 °C. Protein concentration was 20 μM.
