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15N Relaxation profiles of Δ131Δ at pH 5.2 in the absence (solid squares) and presence (open triangles) of 8 M urea at pH 5.2. The cross signs represent data at pH 3.0 in the presence of 8 M urea. (A–C) 15N NOE, relaxation interference, and transverse R2 profiles, respectively.
