protein complex extracellular region part interleukin-23 complex 2009-06-23T01:06:02Z A protein complex that is composed of an interleukin-23 alpha (p19, product of the IL23A gene) and an interleukin-12 beta (p40, product of the IL12B gene) subunit and is secreted into the extracellular space. GO:0070743 IL-23 complex IL12B IL23A Note that this heterodimeric cytokine utilizes the same beta subunit as IL-12. cellular_component go.owl midori p19 p40 pro.owl