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Scatter plots of Phipps’ ELISA (A), Phipps’ ELISA with competitive ELISA incubations (B), and competitive ELISA performed in two laboratories (C and D). The wider dispersion in the low data range (0.1 to 2.0 μg/ml) was confirmed with the noncompetitive ELISAs (A and B). The data dispersion was largely reduced with the competitive assay performed in two different laboratories (C and D). Abs, antibodies.
