B Cells (B-Lymphocytes)
B lymphocytes, the cells that produce antibodies, were so called because in birds they were found to mature in an organ called the Bursa of Fabricius. In mammals, no anatomic equivalent of the bursa exists, and the early stages of B cell maturation occur in the bone marrow. Thus, B lymphocytes now refer to bone marrow–derived lymphocytes. B cells are …