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Competitive inhibition of binding with unlabelled tissue transglutaminase (tTG) of immunoglobulin A (IgA) tGT autoantibodies. Increasing amounts of unlabelled tTG were added to one IgA-tissue transglutaminase (TGA)-negative (○) and five positive serum samples in the second incubation of the fluorometric assay, in which IgA–TGA is captured by bio-tTG in SA-wells.
