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Absolute basophil counts (A), whole-blood FCER1A gene expression (B), serum tryptase levels (C), and CCL2 serum concentrations (D) in ED patients divided according to the severity of acute allergic reactions (Mueller grade I-II vs grade III-IV) and then 7 and 30 days after the episode. The threshold for diagnostically positive tryptase measurement was set at 11.2 μg/L. Data are presented as a person-to-person scatter plot.
