Figure 2. FT-IR spectra of aS dimers at pH* 7.2.

Curve fitting was performed with Gaussian and Lorentzian lineshapes and with bandwidths varying between 15 and 20 cm⁻¹. The peak position of the amide band components was deduced from the second derivative spectra (Fig. S2). The sum of the fitted curves is shown as a broken line, closely overlapping the experimental trace, shown as a continuous line.