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*[[Macrophages - Anatomy & Physiology|Macrophages]] and dendritic cells in the marrow remove foreign substance from the blood
 
*[[Macrophages - Anatomy & Physiology|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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==In patholgoy==
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*[[Lymphoreticular/Haemotopoietic System - Bone Marrow#Pathology|See here]]