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Secondary chemical shifts for carbonyl, Cα, and Cβ sites in F19, L34, and G38, relative to random coil shifts reported by Wishart et al.43 Error bars indicate the full widths at half maxima measured from crosspeaks in 2D ssNMR spectra of the Aβ40 samples. In addition to data from DNP-enhanced spectra of high pH, neutral pH, protofibril, and fibril samples in frozen solutions, data are shown for an Aβ40 powder prepared by lyophilization of an HFIP solution.
