+Receptors are specialized [Protein](/wiki/protein) structures, often on a [Cell](/wiki/cell)'s surface, that await specific molecular signals. When a signal molecule binds, it triggers a cascade of internal events, allowing the cell to sense and react to its environment.
+## See also
+- [Ligand](/wiki/ligand)
+- [Signal](/wiki/signal)
+- [Hormone](/wiki/hormone)
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