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The spleen is an organ involved in the production and maintenance of red blood cells, the production of certain circulating white blood cells, as a part of the lymph system, and as a part of the immune system

Review Date 5/4/2015

Updated by: Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.