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Recombinant IL-4 blocks the binding of anti-IL-4 antibody with intracellular IL-4. Intracellular IL-4 staining following polyclonal stimulation with phorbol 12-myristate 13-acetate (PMA) and ionomycin (thick line), and after the blocking of anti-IL-4 antibody by recombinant human IL-4 (thin line).
