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Serum IgG4 and IgE levels and IgE/IgG4 ratio in IgG4-RD and HC. Dot plots showing (A) serum IgG4 concentrations, (B) serum IgE concentrations, (C) IgE/IgG4 ratio (kIU/g), in IgG4-RD patients and HC. The y-axis shows the serum IgE concentration (KU/L), serum IgG4 (g/L), or IgE/IgG4 ratio. Dashed line is the serum IgE upper limit of normal (≥125 kIU/L) and serum IgG4 upper limit of normal (≥1.4 g/L). Mann-Whitney P values; NS P < .05, ****P < .0001.
