“…Although this might be achieved by binding the antigen to an anchor lipid, which is subsequently applied as an additive in the vesicle formulation, such incorporation is expected to leave almost half of the antigens ineffective, because they are facing the inside of the drug carrier rather than the outside. Chemical coupling of functionalized antigens with complementary functional groups on vesicular assemblies, on the other side, enables a selective introduction of recognition domains on the extracellular surface, , as shown in Figure .…”