Butyrylcholinesterase EC 31118 BChE Choline

esterase II; Pseudocholinesterase A family of enzymes produced mainly in the liver that hydrolyse esters, e.g. procaine and suxamethonium. Occurs as a number of variants, dependent on four alleles, with variable degrees of cholinesterase function. The nature of the variants determines sensitivity to suxamethonium; the extreme is pseudocholinesterase deficiency. Is known to metabolize cocaine in humans.

BY2 cells Line of tobacco (Nicotiana tabacum) cells that will grow in suspension culture.

byssinosis Asthma-like respiratory disease in people exposed to dust from vegetable fibres (cotton, jute, flax).

bystander effect Phenomenon in which mammalian cells irradiated in culture produce damage-response signals which are communicated to their unirradiated neighbours. The mechanism is unclear, but the implications are important in radiation biology.

bystander help Lymphokine-mediated non-specific help by T-lymphocytes, stimulated by one antigen, to lymphocytes stimulated by other antigens.

Coping with Asthma

Coping with Asthma

If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.

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