A protein kinase catalyzes the phosphorylation of another protein kinase, which in turn catalyzes the phosphorylation of a third protein kinase. This series of multiple enzyme sequences is an excellent example of

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This series of phosphorylation events is an example of amplification, where a single activation event leads to a cascade of multiple downstream activations, greatly increasing the signal.

A Protein Kinase Catalyzes the Phosphorylation of Another Protein Kinase