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Membrane
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Membrane is a thin layer that separates two compartments or spaces. In a cell, the membrane is a semi-permeable barrier that controls the movement of molecules and ions across the cell boundary. Membranes are composed of a lipid bilayer, which is a two-layer of phospholipids, with hydrophilic heads and hydrophobic tails. Membranes also contain proteins, which help to facilitate the transport of molecules and ions across the membrane.
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