only in taxon develops from Gnathostomata <vertebrates> Homo sapiens spleen https://upload.wikimedia.org/wikipedia/commons/d/d6/Illu_spleen.jpg lienal splenic It synthesizes antibodies in its white pulp and removes, from blood and lymph node circulation, antibody-coated bacteria along with antibody-coated blood cells In humans, it is located in the left upper quadrant of the abdomen. It removes old red blood cells and holds a reserve in case of hemorrhagic shock, especially in animals like horses (not in humans), while recycling iron hemopoietic organ immune organ spleen primordium digestive system element abdominal viscera