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Relationship between serum total IgG2 concentration (g/l) and specific IgG2 anti-Pneumovax II concentration (mg/l) by ELISA in 14 gold-treated rheumatoid arthritis (RA) patients (•) and five RA controls (▴) with IgG2 deficiency. Specific IgG2 anti-Pneumovax II concentration in a pool of normal human serum shown by the horizontal line.
