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===Lymphoid tissue===
===Lymphoid tissue===
[[Image:LH Bone Marrow Granulocyte Histology.jpg|thumb|75px|'''Developing granulocytes''' ©RVC 2008]]
[[Image:LH Bone Marrow Granulocyte Histology.jpg|thumb|75px|'''Developing granulocytes''' ©RVC 2008]]
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*In some primates it acts as a [[Primary Lymphoid Tissue - Anatomy & Physiology|primary lymphoid organ]]
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*In some primates it acts as a [[:Category:Primary Lymphoid Tissue|primary lymphoid organ]]
*Bone marrow is also a [[Secondary Lymphoid Tissue - Anatomy & Physiology|secondary lympoid tissue]]
*Bone marrow is also a [[Secondary Lymphoid Tissue - Anatomy & Physiology|secondary lympoid tissue]]
<p>It has little involvement in the primary immune response, but the migration of [[B cell differentiation - WikiBlood#Memory cells|memory cells]] into the marrow from the [[Spleen - Anatomy & Physiology|spleen]] and [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] means that during a subsequent exposure to an antigen it produces significant amounts of antibodies.</p>
<p>It has little involvement in the primary immune response, but the migration of [[B cell differentiation - WikiBlood#Memory cells|memory cells]] into the marrow from the [[Spleen - Anatomy & Physiology|spleen]] and [[Lymph Nodes - Anatomy & Physiology|lymph nodes]] means that during a subsequent exposure to an antigen it produces significant amounts of antibodies.</p>