Lipid bilayer membrane. Molecular model of a lipid bilayer membrane consisting of lipids that consist of a hydrophobic hydrocarbon chain (green) and a hydrophilic phosphate end (pink, blue and yellow). In water, the hydrophobic ends orientate away from water molecules, while the hydrophilic ends bond with the water molecules. Thus the lipids assemble in opposing pairs to form the bilayer structure seen here and in cell membranes. The exterior of the cell is at left, with the interior of the cell and large macromolecules (white) at right.
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