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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 one or more of a family of substances (tumor necrosis factor receptors, abbreviated as TNFR) that bind one or more of the cytokine tumor necrosis factors and other clinically significative ligands. TNFRs may initiate apoptosis, cell proliferation, or both.
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