+The **thymus** is a small, specialized organ of the [immune system](/wiki/Immune_system), nestled behind the sternum. It serves as a vital training ground where [T cells](/wiki/T_cell) mature, learning to protect the body against pathogens. Its role is most critical during childhood, gradually shrinking with age.
+## See also
+- [Lymphoid Organ](/wiki/Lymphoid_Organ)
+- [Immunity](/wiki/Immunity)
+- [White Blood Cell](/wiki/White_Blood_Cell)
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