Lipid lateral diffusion coefficients obtained for samples with the molar composition 42.5:42.5:15 of DOPC/DPPC/CHOL (left), DOPC/DPPC-d75/CHOL (middle), and DOPC/DPPC/25FCH (right). Diffusion measurements of three nuclei are shown: 1H (circles), 2H (squares), and 19F (triangles). For two-component diffusion, the symbol sizes are proportional to the relative amount of each component. Also shown in the left plot are 1H diffusion data for the DOPC/DPPC-d75 system (solid line) and for the previously published DOPC/SM/30% CHOL system (plus signs) (37).