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The specialized functions of different membranes are largely determined by the blank they contain. Membrane lipids are blank molecules, composed of a hydrophilic portion and a hydrophobic portion. All cell membranes have the same blank structure, with the blank of the phospholipids facing into the interior of the membrane and the blank on the outside. The most common lipids in most cell membranes are the blank . The head group of a glycolipid is composed of blank .