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explain the nature of Lipid rafts structures

Lipid rafts provide another example of the complexity of cell surfaces in both their structural character and biologic functionality. Please explain the nature of these structures and their functionality.

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Cellular plasma membranes are formed by combination of various protein receptors and glycosphingolipids[Whata are the primary lipid componetsw from which plasma membranes are formed?  Glycosphingolipids are componets, but are these the primary lipid components from which the PM is constituted?] 

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