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*[[Macrophages - WikiBlood|Macrophages]] and dendritic cells in the marrow remove foreign substance from the blood
*[[Macrophages - WikiBlood|Macrophages]] and dendritic cells in the marrow remove foreign substance from the blood
**A process which also occurs in the [[Lymph Nodes - Anatomy & Physiology|lymph nodes]], [[Spleen - Anatomy & Physiology|spleen]] and [[Liver - Anatomy & Physiology#Functions|liver]]
**A process which also occurs in the [[Lymph Nodes - Anatomy & Physiology|lymph nodes]], [[Spleen - Anatomy & Physiology|spleen]] and [[Liver - Anatomy & Physiology#Functions|liver]]
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<big><center>[[Lymphatic System - Anatomy & Physiology|'''BACK TO LYMPHATIC SYSTEM''']]</center></big>
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<big><center>[[Lymphoreticular System - Anatomy & Physiology|'''BACK TO LYMPHORETICULAR SYSTEM''']]</center></big>
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<big><center>[[Primary Lymphoid Tissue - Anatomy & Physiology|'''BACK TO PRIMARY LYMPHOID TISSUE''']]</center></big>