Biology / Bio 0817 · Atom · ~20 seconds
Terminating a Signal
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A cell terminates a signal by degrading its ligand and by reversing the intracellular modifications the signal caused, such as dephosphorylating a target protein.
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A phosphatase enzyme removes the phosphate a kinase added earlier, reversing that cascade step.
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A cascade's initiation and termination are both actively managed — a signal does not fade away on its own.