Effect of increasing amounts of DPPC or bovine brain SPM in POPC donor vesicles on the GLTP-mediated (1 µg) transfer of AV-GalCer to POPC acceptor vesicles: (A) DPPC-POPC donor vesicles, (B) bovine brain SPM-POPC donor vesicles. Traces (a) 22.5%, (b) 47.5%, (c) 72.5%, (d) 82.5%, (e) 92.5%, and (f) 97.5% represent increasing amounts of DPPC or bovine brain SPM in mol %.