Word Count : 279

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The cell membrane, also known as the plasma membrane, is a selectively permeable barrier that surrounds the cell and regulates the movement of substances in and out. Its structure is best explained by the Fluid Mosaic Model proposed by Singer and Nicolson in 1972. According to this model, the membrane is composed of a phospholipid bilayer with proteins embedded within it, giving it a mosaic-like appearance. The phospholipid bilayer _____ ______ ___ ___ _________ _______ _____ _______ _____.
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