- Biol.1. Also called B lymphocyte. a type of lymphocyte, developed in bone marrow, that circulates in the blood and lymph and, upon encountering a particular foreign antigen, differentiates into a clone of plasma cells that secrete a specific antibody and a clone of memory cells that make the antibody on subsequent encounters.2. Also called beta cell. a cell in the islet of Langerhans that produces and secretes insulin.
* * *One of the two types of lymphocytes (the others being T cells).All lymphocytes begin their development in the bone marrow. B cells are involved in so-called humoral immunity; on encountering a foreign substance (antigen), the B lymphocyte differentiates into a plasma cell, which secretes immunoglobulin (see antibody).
* * *▪ biologyOne of the two types of lymphocytes (lymphocyte) (the others being T cells). All lymphocytes begin their development in the bone marrow. B cells are involved in so-called humoral immunity; on encountering a foreign substance ( antigen), the B lymphocyte differentiates into a plasma cell, which secretes immunoglobulin (see antibody).
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