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The fluid mosaic model is a widely accepted description of the structure of biological membranes, proposed by Singer and Nicolson in 1972. According to this model, the cell membrane is not a rigid structure but rather a dynamic and flexible arrangement composed of lipids, proteins, and carbohydrates. The fundamental framework of the membrane is a bilayer of phospholipids, where the hydrophilic phosphate __________ ________ ___ ___ ___ _____ _____.
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