How is a lipid bilayer formed?

The outer cell membrane consists of a lipid bilayer enclosed between two layers of proteins. It is known that phospholipid molecules have hydrophilic-hydrophobic properties. If they get into water, they are arranged so that their hydrophobic parts come into close contact with each other, and the hydrophilic parts with water. Such molecules are able to spontaneously form bilayer structures in the form of small closed bubbles.

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