+A **Receptor Agonist** is a molecule that binds to and activates a [receptor](/wiki/receptor) in a cell, triggering a biological response. It mimics the action of a natural messenger, opening a pathway for cellular communication. Unlike an [antagonist](/wiki/antagonist), it initiates rather than blocks a signal.
+## See also
+- [Ligand](/wiki/ligand)
+- [Pharmacology](/wiki/pharmacology)
+- [Signal Transduction](/wiki/signal_transduction)
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