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* As a part of the brain they have immunological protection from the [[Nervous System - CNS - Anatomy & Physiology#Lymphatics|cerbral spinal fluid]].  
 
* As a part of the brain they have immunological protection from the [[Nervous System - CNS - Anatomy & Physiology#Lymphatics|cerbral spinal fluid]].  
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See [[Immunology - Anatomy & Physiology|immunology]].
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See [[Immunology - WikiBlood|immunology]].