The following reagents were purchased: maleimide-PEG5000-carboxyl-NHS from NOF Corporation (Tokyo, Japan); 1,2-distearoyl-sn-glycero-3-phosphoethanolamine (DSPE) and cholesterol (chol) from Nippon Fine Chemicals (Osaka, Japan); Alexa Fluor® 488 C5-maleimide from Life Technologies (Carlsbad, CA, USA); CPZ hydrochloride, Nys, MβCD, Cyto D, Wort, and bacitracin from Sigma-Aldrich (St Louis, MO, USA); and rhodamine-PE lipid (Rho-PE) from Avanti Polar Lipids (Alabaster, AL, USA). The required 1,5-dioctadecyl L-glutamate (Glu2C18), PEG5000-Glu2C18, PEG5000-DSPE, GGLG, and maleimide-PEG5000-Glu2C18 were synthesized in our laboratory using previously published methods.17 (link)–19 (link)