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Liposomal Nanoparticle
This artificially constructed, spherical vesicle—a drug delivery liposome—has a selectively permeable wall that closely resembles the membrane of a living cell. The membrane consists of a dual layer of phospholipids. Each phospholipid consists of a phosphate group head (orange) and a fatty acid tail (purple). (Credit: Tammy Kalber and Simon Richardson, UCL CABI/Science Source)
