We used the well-characterized model system consisting of zwitterionic DMPC and anionic DMPG, in a ratio that roughly mimics the membrane charge of E.coli, to prepare large unilamellar vesicles (LUVs) in a salt free Tris buffer at physiological pH. The same batch of LUVs was split into three parts. Two of these three were incubated with indolicidin (1:20 PL ratio) and LL-37 (1:100 PL ratio), respectively, for 30 minutes. The remaining fraction was simply diluted with Tris so that all fractions were at the same concentrations. These vesicles were all subjected to osmotic shock, through the addition of NaCl solution of various concentrations. After salt addition, the samples were again allowed to incubate for 30 minutes before they were characterized using SAXS. The resulting static scattering curves, collected at the BM29 beamline, are presented in figure .