lymphocyte

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lymphocyte

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

lymphocyte Type of leucocyte (white blood cell) found in vertebrates. Produced in bone marrow, they are mostly found in the lymph and blood and around infected sites. In human beings, lymphocytes form c.25% of white blood cells and play an important role in combating disease. B-lymphocytes produce antibodies and T-lymphocytes maintain immunity. See also antibody

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lymphocyte

A Dictionary of Biology | 2004 | Â© A Dictionary of Biology 2004, originally published by Oxford University Press 2004. (Hide copyright information) Copyright

lymphocyte A type of white blood cell (leucocyte) that has a large nucleus and little cytoplasm. Lymphocytes are formed in the lymph nodes and provide about a quarter of all leucocytes. They are important in the body's defence and are responsible for immune reactions as the presence of antigens stimulates them to produce antibodies. There are two populations of lymphocytes: B lymphocytes (see B cell), which produce circulating antibodies and are responsible for humoral immunity; and T lymphocytes (see T cell), which are responsible for cell-mediated immunity. See also killer cell.

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