noun, Immunology.
the aggregate of the phagocytic cells, including certain cells of the bone marrow, lymphatic system, liver, and spleen, that have reticular and endothelial characteristics and function in the immune system’s defense against foreign bodies.
Abbreviation: RES.

reticuloendothelial system n.
Abbr. RES
The diffuse system constituting all phagocytic cells of the body except granulocytes including the cells lining the sinusoids of the spleen, lymph nodes, and bone marrow along with the fibroblastic reticular cells of hematopoietic tissues.


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