killer cell

kill·er cell (klr)

n.

A large differentiated T cell that attacks and lyses target cells bearing specific antigens. Also called cytotoxic T cell, killer T cell, null cell.

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killer cell,

n a lymphocyte that develops in the bone marrow and lacks the characteristic surface markers of the B and T lymphocytes. Killer or null cells represent a small proportion of the lymphocyte population. Stimulated by the presence of an antibody, null cells can attach certain cellular targets directly and are known as
natural killer cells.

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killer cell

see K cells.