Word Count : 240

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The cell membrane, also called the plasma membrane, is a selectively permeable barrier that encloses the cell and regulates the movement of substances in and out. Its structure is best explained by the fluid mosaic model, which describes it as a dynamic bilayer of lipids and proteins. The basic framework consists of a phospholipid bilayer where phospholipids arrange themselves with ________ _______ ____ _____ ______ _______ _______ _________ ____ ___ ____.
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