+The **lipid bilayer** is the essential, two-layered framework of nearly all [cell membranes](/wiki/cell_membrane). This self-assembling barrier, composed primarily of [lipids](/wiki/lipid), delicately encloses the cell's contents, regulating passage and defining its living space.
+## See also
+- [Membrane Protein](/wiki/membrane_protein)
+- [Phospholipid](/wiki/phospholipid)
+- [Cell Biology](/wiki/cell_biology)
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