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Correlation between plasma levels of IgG4 (a) or IgE (b) and in vitro IgG4 or IgE produced by anti-CD2 + IL-2-stimulated PBMC. IgG4 levels correlated significantly (r = 0.534, P = 0.002, n = 36), whereas IgE did not (r = 0.285, P = 0.107, n = 36). •, Filarial subjects; ▵, European control donors.
