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"Reticuloendothelial system
The RE system stands for ReticuloEndothelial system :-D
RES can mean, Reticuloendothelial system, which is a part of your body's immune system.
it therefore avows that the reticuloendothelial system is a fixed one.
The reticuloendothelial cellslocated in the blood cavities of the liver are calledKupffer cells.