Describe the role of G-protein coupled receptors (GPCRs) in signal transduction of cells.

G-protein coupled receptors (GPCRs) play a crucial role in cellular signal transduction by facilitating communication between the cell and its environment. They are membrane-bound proteins that detect extracellular signals such as hormones, neurotransmitters, and sensory stimuli, initiating a cascade of intracellular events.

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