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Immunoassay reagents intended to perform qualitative and/or quantitative immunologic tests of a sample of body fluids (typically serum) to determine messenger proteins (i.e., cytokines) produced by the cells that regulate the intensity and duration of the immune response. These regulator proteins are named lymphokines when produced by T lymphocytes. Other groups of cytokines are the interleukins; the interferons, which play an important role in the enhancement of the immune response; and tumor necrosis factors, which have cytotoxic activity against tumor and virally infected cells. Cytokine determination reagents are frequently available in kits.
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