Changes

[[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]]

*In some primates it acts as a [[:Category:Primary Lymphoid Tissue|primary lymphoid organ]]

*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 [[:Category:Secondary Lymphoid Tissue|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>