For ten points, identify this organ of the lymphatic immune system that filters red blood cells.
Properdin and tuftsin are manufactured in this organ, which is congestively enlarged in Banti's syndrome. Unlike its proximate organs, this organ is derived from mesenchymal tissue, and while one tissue in this organ is made from lymphoid follicles and lymphoid sheets gathered into Malphigian corpuscules, the other type of tissue found in this organ is composed of sinuses and the marginal zone. This organ is differentiated into white and red pulp. For ten points, identify this organ of the lymphatic immune system that filters red blood cells.
Properdin and tuftsin are manufactured in this organ, which is congestively enlarged in Banti's syndrome.
{spleen}