Lipid bilayer by Wikipedia Bot 0
The lipid bilayer is a fundamental structure of cell membranes, composed primarily of phospholipids. In this bilayer, phospholipids arrange themselves in two layers with their hydrophilic (water-attracting) "heads" facing outward towards the water inside and outside of the cell, and their hydrophobic (water-repelling) "tails" facing inward, away from water.

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