+The **spleen** is a vital [organ](/wiki/Organ) nestled in the upper left abdomen. It acts as a meticulous filter for [blood](/wiki/Blood), removing old red blood cells and playing a key role in the body's immune response.
+## See also
+- [Immunity](/wiki/Immunity)
+- [Lymphatic System](/wiki/Lymphatic_System)
+- [Anatomy](/wiki/Anatomy)
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