Stelara is a human IgG1κ monoclonal antibody that binds with high affinity and specificity to the p40 protein subunit used by both the interleukin (IL)-12 and IL-23 naturally occurring cytokines. IL-12 and IL-23 are involved in inflammatory and immune responses, such as natural killer cell activation and CD4+ T-cell differentiation and activation. Ustekinumab is used to treat plaque psoriasis, a certain type of arthritis (psoriatic arthritis), or certain bowel conditions (Crohn's disease, ulcerative colitis). <a id="
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