Phospholipids are main components of the cellular membrane with characteristics of excellent biocompatibility and especial amphiphilicity. When introduced into aqueous milieu, the amphiphilic phospholipids self-assembly generates different structures depending on their properties, for example, bilayers, micelles, and liposomes. The molecule structure of phospholipid consists of a hydrophilic head group and hydrophobic acyl chains linked to the alcohol. 
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