Liposomes are spherical
vesicles with a membrane composed of a
lipid bilayer. The lipid bilayer can fuse with other bilayers (e.g., the
cell membrane), and so deliver the contents of the liposome to the cell. Whatever media in which liposomes are created is internalized. By making liposomes in a solution of
DNA or drugs, which would normally be unable to
diffuse through the membrane, these can be (indiscriminately) delivered past the lipid bilayer.
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