For ten points, name this type of lymphocyte that matures in the Bursa of Fabricius in birds, but in the bone marrow of mammals.
An October 2006 article in Nature shows that this type of cell is capable of phagocytosis in primitive vertebrates, hinting at its evolutionary origins. They are notable for the VDJ recombination, where they rearrange their own DNA as they mature in order to produce widely varying immunoglobulins on their surface. They can be divided into two types; the "Plasma" type creates antibodies, while the "Memory" type is long-lived and forms a new generation of plasma cells in response to an infection previously encountered. For ten points, name this type of lymphocyte that matures in the Bursa of Fabricius in birds, but in the bone marrow of mammals.
An October 2006 article in Nature shows that this type of cell is capable of phagocytosis in primitive vertebrates, hinting at its evolutionary origins.
{B cells}