system of macrophages

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Noun1.system of macrophages - a widely distributed system of free and fixed macrophages derived from bone marrow
system - a group of physiologically or anatomically related organs or parts; "the body has a system of organs for digestion"
RES, reticuloendothelial system - a widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells
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