B cell
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  B cell

B cell

    The precursors of antibody-forming plasma cells; these cells carry immunoglobulin and class II MHC (major histocompatibility complex) antigens on their surfaces.


The watery, liquid part of the blood in which the red blood cells, the white blood cells, and platelets are suspended.

A serum protein involved in immunity. An antibody.

Literally, the ability of tissues to get along; in immunology, it means identity in all transplantation antigens. These antigens, in turn, are collectively referred to as histocompatibility antigens.

Substances that cause an immune response in the body. The body "sees" the antigens as harmful or foreign. To fight them, the body produces antibodies, which attack and try to eliminate the antigens.


B cepacia
See: Burkholderia cepacia.


Involuntary discharge of urine after the age at which urinary control should have been achieved; often used alone with specific reference to involuntary discharge of urine occurring during sleep at night (bed-wetting; nocturnal enuresis).

Benign prostatic hypertrophy
Enlargement or overgrowth of the prostate gland as a result of an increase in the number of its constituent cells.

Excessive winking; tonic or clonic spasm of the orbicularis oculi muscle.

Baldness (formally alopecia) is the state of lacking hair where it usually would grow, especially on the head. The most common form of baldness is a progressive hair-thinning condition that occurs in adult humans and many other ape species. Stress factors such as a regular lack of sufficient sleep may be able to accelerate the onset of hair loss in genetically prone individuals.

B lymphocyte
The precursors of antibody-forming plasma cells; these cells carry immunoglobulin and class II MHC (major histocompatibility complex) antigens on their surfaces.

B cell

A polymorphonuclear leukocyte., whose basophils granules contain heparin, histamine and other vasoactive amines. Within tissues, these cells are known as mast cells q.v.

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.

A bezoar is a ball of swallowed foreign material (usually hair or fiber) that collects in the stomach and fails to pass through the intestines.

Balloon valvuloplasty
Plastic surgery to repair a valve, especially a heart valve.

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