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The G-protein receptor system and tyrosine-kinase receptor system are two distinct mechanisms of signal transduction. G-protein-coupled receptors (GPCRs) activate intracellular signaling through the binding of G-proteins, which then trigger various downstream effects, often involving second messengers like cAMP or calcium ions. In contrast, tyrosine-kinase receptors, upon ligand binding, undergo dimerization and autophosphorylation, leading to the activation of multiple signaling pathways primarily involved in growth and differentiation. Thus, the main difference lies in their mechanisms of activation and the types of cellular responses they mediate.

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