(A) Fluorescence spectra of BODIPY-FL-Cys26-Aβ, 4 μM in Tris-HCl buffer, pH 7.4 (1), directly after addition of LUVs composed of GM1/bSM/Chol in the molar ratio 3:4:3 (470 μM GM1) and containing 0.6 mol % 564/571-BODIPY-C5-GM1 (2), after 6 days incubation (3), and after addition of Triton X-100 (4). (B) Steady-state fluorescence anisotropy, r, of systems 2–4 in A. The excitation wavelength was 470 nm.