has part protein-containing complex interleukin-12 complex IL-12 complex A protein complex that is composed of an interleukin-12 alpha (p35, product of the IL12A gene) and an interleukin-12 beta subunit (p40, product of the IL12B gene) and is secreted into the extracellular space. http://purl.obolibrary.org/obo/go.owl Note that this heterodimeric cytokine utilizes the IL-12p35 subunit as its alpha chain, which is also used by IL-35 as its alpha chain, and utilizes the IL-12p40 subunit as its beta chain, which is also used by IL-23 as its beta chain. interleukin-12 subunit alpha interleukin-12 subunit beta