b,c Their secondary structure was analyzed by circular dichroism spectroscopy in the presence of increasing concentrations of hexafluoro-2-propanol (HFIP), in the presence of 6 mM small unilamellar vesicles (SUVs, 70% egg PC and 30 % PS, total phospholipid concentration approx. 6 mM), or of or control buffer only (blue). Spectra are shown for c, the SLoop peptide. 