The spleen is an organ found in all vertebrates. It is a large secondary lymphoid organ that primarily functions as a blood filter. The second spleen’s function is immune system surveillance. As a specialized immune organ, the spleen plays a significant role in innate and adaptive immunity. Specifically, the spleen is a crucial organ for peripheral immune tolerance, complementing central immune tolerance. Splenectomy in both study animals and humans results in overwhelming infections with especially, encapsulated bacteria [1]. On the opposite, supporting the immune system with an additional s