| http://www.w3.org/ns/prov#value | - The bilayer may be modified to display (i) polymers such as polyethylene glycol (PEG) on the surface to prolong the plasma circulation time (sterically stabilized liposomes); (ii) immunoglobulins or immunoglobulin fragment antigen binding (Fab???) to target specific antigens or receptors (immunoliposomes); or (iii) positive charge (cationic liposomes).
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