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Cell surface receptors are specialized protein molecules located on the plasma membrane that allow cells to detect and respond to extracellular signals, such as hormones, neurotransmitters, and growth factors. These receptors play a crucial role in transmitting information from the extracellular environment to the cell's interior, thereby regulating physiological processes such as metabolism, growth, differentiation, and immune responses. They act as signal ____ ____ ______ ______ __________ ____ __________.
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