Two schematic representations of a phospholipid. The P represents the polar hydrophilic head group of the molecule, highlighted in red. The U indicates the uncharged hydrophobic portion of the molecule, highlighted in blue.

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Two schematic representations of a phospholipid. The P represents the polar hydrophilic head group of the molecule, highlighted in red. The U indicates the uncharged hydrophobic portion of the molecule, highlighted in blue.