+G proteins act as crucial molecular switches, relaying signals from [Receptor](/wiki/receptor)s on the cell's surface to the cell's interior. By binding GTP or GDP, these proteins change shape, activating or deactivating downstream targets, thus orchestrating vital aspects of [Cell Signaling](/wiki/cell_signaling).
+## See also
+- [Protein](/wiki/protein)
+- [Second Messenger](/wiki/second_messenger)
+- [Hormone](/wiki/hormone)
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