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The monoclonal antibody recognizes human IL12 (p40/p70), a cytokine that acts on T and natural killer cells, and has a broad array of biological activities. IL-12p70 is the biologically active form and is composed of two subunits: IL-12p35 (also named IL-12A) and IL-12p40 (also named IL-12B). The p35 subunit has homology to IL-6, while p40 has homology with IL-23. The p40 subunit has been found to be expressed in a higher excess over p70. It is present in serum and plasma as a monomer, a heterodimer with IL-12p35 (biologically active IL-12p70) or heterodimer with IL-23p19 (IL-23). The subunits are genetically unrelated and regulated independently: IL-12p40 is produced constitutively and in excess of IL-12p35 and IL-23p19.