TEM images of SF and of DMPC/DMPG (1:1 molar ratio) without and with lipopeptide, using negative staining (A, B, and C) and cryo-TEM (D). (A) SF micelles, bar: 100 nm. (B) MLV in the absence of peptide, bar = 200 nm. (C) With SF, Ri = 50, bar: 200 nm. (D) Same as C observed using cryo-TEM, bar: 25 nm.