MAURIZIO DE ANGELIS / SCIENCE PHOTO LIBRARY MAURIZIO DE ANGELIS / SCIENCE PHOTO LIBRARY
Liposome, cut-away illustration. This artificially-constructed, spherical vesicle possesses a selectively-permeable wall that closely resembles the membrane of a living cell. The membrane consists of a dual layer of phospholipids. Each phospholipid molecule consists of a hydrophilic (water-soluble) phosphate group head (round) and a hydrophobic (water-insoluble) fatty acid tail. Liposomes can be used to carry drugs or genes to target cells. This is particularly useful for highly toxic cancer drugs as it reduces unpleasant side effects.
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