The antimicrobial peptides indolicidin (ILPWKWPWWPWRR), LL-37 (LLGDFFRKSKEKIGKE-FKRIVQRIKDFLRNLVPRTES) and aurein 2.2 (GLFDIVKKVVGALGSL), also in the form of high purity (98 %) powders were purchased from TAG Copenhagen A/S and used as supplied. Peptide stock solutions were prepared by dissolving the peptides in the same Tris buffer used to prepare the vesicles. NaCl (Sigma Aldrich) was also dissolved in the same Tris buffer to a concentration of 1.20 M, and then diluted to prepare 0.60, 0.30 and 0.15 M NaCl solutions. It is emphasized that the vesicles, peptides and salt solutions were all prepared using the exact same batch of Tris buffer.