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==Introduction==
''Also referred to as the reticuloendothelial system or mononuclear phagocytic system.''
''Also referred to as the reticuloendothelial system or mononuclear phagocytic system.''
It is comprised of [[Primary Lymphoid Tissue - Anatomy & Physiology|primary]] lymphoid organs which are responsible for the production of lymphocytes and the [[Secondary Lymphoid Tissue - Anatomy & Physiology|secondary]] lymphoid organs which function to provide an environment where [[Lymphocytes|lymphocytes]] can react to antigen from the tissue fluid, blood and mucosal surfaces.
It is comprised of [[Primary Lymphoid Tissue - Anatomy & Physiology|primary]] lymphoid organs which are responsible for the production of lymphocytes and the [[Secondary Lymphoid Tissue - Anatomy & Physiology|secondary]] lymphoid organs which function to provide an environment where [[Lymphocytes|lymphocytes]] can react to antigen from the tissue fluid, blood and mucosal surfaces.