- B -
B lymphocyte (B cell)
The precursors of antibody-forming plasma cells; these cells carry immunoglobulin and class II MHC (major histocompatibility complex) antigens on their surfaces.
Basophil
A polymorphonuclear leukocyte., whose basophils granules contain heparin, histamine and other vasoactive amines. Within tissues, these cells are known as mast cells q.v.
Bence-Jones protein
Dimers of immunoglobulin light chains in the urine of patients with multiple myeloma.
Blocking antibody
A functional term for an antibody molecule capable of blocking the interaction of antigen with other antibodies or with cells.
Bursa of Fabricius
An outpouching of the cloaca in birds; site of development of B cells in birds.
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