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Depletion of IgG4 antibodies from serum #741. Serum #741 was depleted for IgG4 (▴). As control, a sample was also depleted for IgE (□) and incubated with control Sepharose (○). The three samples were tested for the amount of Der p I-specific IgG (a) and for the binding activity in the heterologous binding assay (b).
